But if you want to care, because the same place name will evolve and change in history, it depends on De Renjie's secluded state and his activity time. De was a famous power minister after the Tang Dynasty, so we should look at Youzhou in the Tang Dynasty:
The article about Jixian County in Youzhou in the Book of the Old Tang Dynasty Geography II said: "From the Jin Dynasty to the Sui Dynasty, thistle was administered by the secretariat of Youzhou." In fact, it has been like this since the Eastern Han Dynasty. At the beginning of the Eastern Han Dynasty, Zhu Fu was the secretariat of Youzhou, and at the end of the Eastern Han Dynasty, Liu Yu was the secretariat of Youzhou. In the 18th year of Emperor Xuanzong of the Tang Dynasty (730), Yuyang, Yutian and Sanhe, which divided the eastern part of Youzhou, were set up in Jizhou (now Jixian County, Tianjin), and gradually referred to Jixian County in Tianjin with the name of thistle. Most of the original Zheng Ji in Youzhou is called Youzhou City, but it is generally no longer called Thistle.
The scale of Youzhou City in the Tang Dynasty, Taiping Universe quoted County Records as saying: "Ji Cheng is 90 miles north and south, 70 miles east and west, and ten doors are open." Accordingly, the circumference of Youzhou City in Tang Dynasty was 32 Li, about 23 Li today (about 0.72 Li per Tang Dynasty). It is a rectangular city, slightly longer from north to south and slightly narrower from east to west. According to the epitaph of Tang Dynasty and Mr. Qilu's research, the following textual research was made on the four cities of Youzhou in Tang Dynasty.
Dongyuan. 195 1 year, the epitaph of Tang Yuan and Ren Chenzi for three years (808) was found in Yu He Bridge, Dongjiaomin Lane, Beijing, and its tomb site was described as Qiliduo (about 5.04 Li today) in the northeast of Youzhou. 1956, in the second year of Tang Jianzhong (78 1), Yao Ziang's epitaph was found in Anle Forest outside Yongdingmen, Beijing, and its tomb site was described as six miles southeast of Youzhou (now about 4.32 miles). These two epitaphs describe the location of Youzhou City in the Tang Dynasty from the northeast and southeast directions, respectively, and the distance is relatively close. About 6 miles and 5 miles southwest and northwest from Yu He Bridge and Anlelin, respectively, is the area around Caishikou, Xuanwu District. There is a Mao Lan Hutong in the south of Lunan, west of Caishikou, formerly known as Lanmian Hutong, which has attracted the attention of scholars who study Beijing's local history. Zhao Jishi, a poet in A Qing, wrote in "To send a message to a garden": "The capital scours ditches in February, and the foul air touches people, especially the rotten hutong, which is two feet deep and two feet wide, and there are no cars and horses. This place is in the east of Renmin Temple (now Fayuan Temple in Beijing). Tang Bei said that the temple is in the southeast corner of Yancheng City, and it is suspected that Youzhou is my city. " Zhu Yixin's Draft of Jingshifang Lane thinks: "There are ancient trenches in the Tang Dynasty here, and it is close if it is appropriate", and agrees with Zhao Jishi's statement. To the west of Lanman Hutong is Fayuan Temple in Beijing today, which is Tang Minzhong Temple. Textual research on Old News of Sun Xia, Volume 60, West Second Outside the City, contains a cloud in the first year of Tang Jingfu (892): "In the southeast corner of Dayan City, there is a Benjamin Temple near Kangqu." According to the same book, the original Zhiquan Temple was later renamed yanshou temple, and the Benjamin-Zhong Temple in the east disappeared. Lanman Hutong is a moat in the east of Tang Youzhou, and Fayuan Temple is located in the southeast corner of Tang Youzhou, so the east wall of Tang Youzhou should be on the north-south line between Lanman Hutong and Fayuan Temple.
In addition, the article "Hengqiaogou" in "The Fifteen Waterways Recorded by Shi Jinglu, a Records of Shuntianfu in Guangxu" wrote: "Hengqiaogou is located in Xizhimen in the east, which is vulgar. South of Mashi Bridge, south of Xuanwumen Xiliwei, into the moat ... tomorrow is called Xihe. " Also known as Xigou in Qing Dynasty. Daming ditch, a Xihe river (ditch), flows southward through the west exit of this new cultural street, Shoushuihe Hutong and Haila Hutong, and enters the moat. According to Zhou's Textual Research on the Capital of Liao and Jin Dynasties, this line between Daming Trench (Xihe River) and Lanman Hutong, "Tang Dynasty should be Dongtonghao". But in fact, Xihe River (ditch) is far from Lanman Hutong, not a line. Zhou's words seem inappropriate.
Xiyuan As mentioned earlier, Tuchengtai, west of Baiyun Temple, is the Ji City of Youzhou in the Western Jin Dynasty and the northwest corner of Youzhou City in the Tang Dynasty. Therefore, Tucheng ruins pass south through the north-south line of Xiaohongmiao Village, which is the western wall of Youzhou City in Tang Dynasty. 1974, the epitaph of Hou Shi in the 9th year of Tang Dynasty (855) was found in the Jinggang Institute north of Ganshiqiao outside Guang 'anmen, and it was recorded that Li San was located in the west of Youzhou. Hou Shi's epitaph was unearthed in the southwest corner of Beijing Iron and Steel Works, 3.5 miles east and west. Accordingly, the western wall of Tang Youzhou is located on the east side of the courtyard, and also on the north-south line between the west Tuchengtai of Baiyun Temple and Xiaohongmiao Village. Therefore, there is no doubt that the Western Wall of Youzhou in Tang Dynasty is located on the north-south line from Tuchengtai of Baiyun Temple to Xiaohongmiao Village. In addition, the Lotus River (Guximagou), which flows eastward from the Lotus Pond (Guxihu Lake) outside Guang 'anmen, suddenly bends to the south at the dry stone bridge, and the river is straight, just on the west side of the aforementioned Xiyuan, which should be the moat in the west of Youzhou in the Tang Dynasty.
Nanyuan 1952, the tomb of Tang Xinzhou secretariat Xue was discovered in Yaojiajing, west of Taoranting Park in the south of Beijing. Although its location is not recorded in the inscription, it is inferred that the south wall of Youzhou in Tang Dynasty should be on the east-west line north of Yaojiajing. In the northwest of Yaojiajing, there is a bug alley, the original bug temple. According to the Ming Dynasty's Shun Tian Zhi, volume seven quoted Yuan Yi Tong Zhi, saying: "Xiaochong Temple ... was set in the early Tang Dynasty according to the records of Youzhou Geography. In the fifth year of Zhenyuan in Dezong (789), Liu Gongji, the right commander and prefect of Pengcheng, lived in the temple. Legends vary. According to the textual research on the beam slab of Qiansi and the left building of Housi, it is right for Liu Zhuang Wugong Ji Zhenyuan to build a temple in the fifth year (789). " As Xiaochong Temple was originally the private residence of Liu Ji, the envoy of Youzhou in Tang Dynasty, it must be in the city. Therefore, the south wall of Youzhou in Tang Dynasty should be between Yaojiajing and Xiaochong Hutong. Some scholars believe that the east-west street of Baizhifang today is the south wall of Youzhou in the Tang Dynasty. However, if Baizhifang Street is taken as an example, the restored city site will be wide from east to west and narrow from north to south, which is different from the record of "nine miles from north to south and seven miles from east to west". In my opinion, the south wall of Youzhou in Tang Dynasty should be on the first line of Liren Street, south of Baizhifang East Street and north of Yaojiajing. In this way, the restored Youzhou City is 6 miles north and south (about 8.3 miles in Tang Dynasty), 5.5 miles east and west (about 7.6 miles in Tang Dynasty) and 23 miles around the city (about 32 miles in Tang Dynasty), which is close to historical records.
The situation of the northern wall of Youzhou in Beichuan in Tang Dynasty is complicated.
1972, the epitaph of Ren Xi in the sixth year of Tang Zhenyuan (790) was unearthed in Xisiyang Hutong, Beijing, and its location was described as the North Wuli of Youzhou. (1) This discovery is very important to judge the position of the northern wall of Youzhou in the Tang Dynasty. Tangwuli is about 3.6 miles today, so it can be inferred that the northern wall of Tangyouzhou is about 3.6 miles south of Mutton Hutong. From Xisiyang Hutong to the south, 4.5 Li (about 6.2 Li in Tang Dynasty) is the first Mao Hutong in Xuanwumennei Street. Hair Hutong is an east-west street, and the terrain is obviously more prominent than the surrounding area, which immediately destroyed the old city wall. A few tens of meters to the north of Hair Hutong, there is a Shoushuihe Hutong parallel to it, which was originally called Choushui River. It turned out to be an open ditch, which had already been leveled. Shoushui River will soon be the site of a moat. From Hair Hutong to the west, through Baiyun Guanbei, it can be connected with the northern end of Tuchengtai ancient city wall. Therefore, the northern wall of Youzhou City in the Tang Dynasty is next to the east-west Hairy Hutong and the West Tucheng Terrace of Baiyun Temple. Shoushuihe Hutong is a moat in the north of Youzhou in Tang Dynasty.
However, this is not the final answer to the question.
1929, the epitaph of Chyi Chin in the first year of Tang Xianheng (670) was found in the courtyard of the Ministry of Education, Erlong Road, Xicheng District, Beijing, and its orientation was described as Wuli in the northeast of Youzhou. The Records of the Shuntian Mansion of Guangxu, Two Records of Scholars and Records of Past Dynasties also contains: "Kangxi had a heart (168 1 year), xi 'anmen had a middle official who ruled the house and dug the ground, and the ancient tomb was wrongly issued ... The inscription said: The epitaph of Puyang Bian Shi was the achievement of the Tang Dynasty. Wen Zhi said: Zhenyuan was ten (five) years old and died in Jibeifang, Jixian County, Youzhou (799). With its age right, it is located in Lixian Township Plain, Wuli, northeast of Youzhou Youdu. "Old Tang Book Geography" contains: "Youdu County, Youzhou, is in charge of the western boundary of Guo Xia, separated from Ji. In the second year of Jianzhong (78 1), Yanzhou House, which was abandoned in Luocheng, was set in Youdu County, one mile north of the house. "The same book" Yanzhou "also records that Yanzhou was the original county of western Liaoning in the Sui Dynasty and was sent to Yingzhou (now Chaoyang, Liaoning). In the sixth year of Wude (623), the self-operated state moved south and was sent to Youzhou City. In the 25th year of Kaiyuan (737), he moved to Beitaogu Mountain in Youzhou. Accordingly, Yudu County in Zhenyuan is located in Youzhou City, five miles northeast of Youdu County, that is, five miles northeast of Youzhou City.
These two epitaphs make it difficult to judge the orientation of the northern wall of Youzhou in Tang Dynasty. Because they recorded the same location and mileage, but the actual unearthed places were far apart. In this regard, a reasonable explanation must be made in order to completely solve the problem of the orientation of the northern wall of Youzhou in Tang Dynasty.
Today, there is an old wall root alley in the east of Xiaxie Street in Xuanwu District, Beijing, which runs from east to west. In the 1930s, there were ancient city ruins here. Zhang Jiangcai's "Yanjing Visiting the Ancient Times" says: "The old wall outside Xuanwu Gate has a semi-deserted section, ten feet long and nine feet high. The city brick is solid, the stone foundation is as new, and one stone is horizontally embedded ... It is engraved with the words "Tian Tong" in official script, the words "the first year of Liao Kaitai" on the left and the words "North Gate" on the right, all of which are official scripts. This is the northeast corner of the inner city of Liao Dynasty. " The real army's "Tian Zhi Owen" speculates that this is the northern wall of Liaoning. In fact, taking the old wall root as the Tongtianmen site in Nanjing, Liaoning Province must be forged by later generations. This can be seen from the description of "the city brick is impregnable and the stone foundation is as new" and the description of the door. However, although the old wall root is not Tongtianmen in Liaoning, it is the ruins of the ancient city, but it is true. Today, the terrain of Laoqianggen Hutong is still outstanding, and the terrain in the south of the street is obviously low, which shows that it was once the remains of the base of the city wall in history. Pushing forward 4.2 Li from the root of the old wall (about 5.8 Li in Tang Dynasty) is the area around Erlong Road in Xicheng District, which is basically consistent with Chyi Chin's epitaph.
Based on this, it is speculated that there may be changes in the northern wall of Youzhou in Tang Dynasty. In the first year of Xianheng (675), the north wall of the city formed a diagonal line from northwest to southeast from the west tucheng platform of Baiyun Temple, so the epitaph of Wei found in the courtyard of the Ministry of Education on Erlong Road was called five miles northeast of Youzhou City. At the latest, in the sixth year of Zhenyuan (790), the city wall to the north of Youzhou was changed to the route from Xituchengtai of Baiyun Temple to Hair Hutong. Therefore, the epitaph of Bian Shi in the 15th year of Zhenyuan (799) discovered by Xi 'anmen and the epitaph of a stone man in the 6th year of Zhenyuan (790) discovered by Xisiyang Hutong are also called the Northeast Wuli or the Youzhou North Wuli. In this reconstruction, the western end of the north city wall has not changed, the eastern end has moved northward, and the east and west have been straightened. The eastern part of the north wall remains as the old wall of Youzhou City. According to the available data, the reconstruction time was between the first year of Xianheng (670) and the sixth year of Zhenyuan (790) 120 years.
To sum up, we can basically confirm that the eastern wall of Youzhou in Tang Dynasty is on the north-south line between Lanman Hutong and Fayuan Temple in Xuanwu District, Beijing; the western wall is on the north-south line from Tuchengtai of Baiyun Temple to Xiaohongmiao Village; the Cheng Nan wall is on the east-west line of Liren Street north of Yaojiajing in Xuanwu District, Beijing; and the northern wall was originally on the line from Xichengtai of Baiyun Temple to the old wall root, and later changed to Tuchengtai to Maofa Hutong.