In mid-April of the third year of the Great Cause, Emperor Yang of Sui set out from Daxing and began his northern tour, and came to Yulin County, the border area between the Sui Dynasty and the Turks, in early June. The emperor stayed in Yulin County for almost a month, and ceremoniously entertained the Qimin Khan and his wife who came to worship, and then in early July, Emperor Yang of Sui traveled west to Wuyuan County, and wrote "Drinking Horses Great Wall Caves" (see Emperor Wen Sui Yang's "Drinking Horses Great Wall Caves" should be written in July of the third year of the Great Cause), and after returning to Yulin County, he came to the location of the Qimin Khan's tooth tent in early August. After ending his visit to the Turks, Emperor Yang of Sui returned south and returned to the eastern capital directly via the annexed state.
Before the northern tour, Emperor Yang of the Sui Dynasty issued an edict explaining the purpose and general scope of the tour. The edict was issued in April Gengchen (2nd) in the third year of the great cause:"The ancients and emperors looked at the customs and customs, and they were all worried about the omen, and they were in the wilderness. Since Fanyi is attached, not to be touched, Shandong is in turmoil, and it is necessary to add a pension. Now I want to settle Hebei, patrol the province of Zhao and Wei. The way it is. "Judging from the content of the edict, the purpose of Emperor Yang of Sui's northern tour was twofold: first, to personally inspect the current Turkic situation;The second is the Shandong (east of Taihang Mountain and north of the Yellow River) area, because of the Yang Lang rebellion, it is also necessary to personally inspect and pacify. However, a slight comparison of the actual route of the three years of the Great Cause and the content of the edict can be found that Emperor Yang of the Sui Dynasty only completed the purpose of pacifying the Turks, but did not go to the Yanzhao region at all. So what is the reason for the change in the patrol plan?
Personally, it is likely that it is because Concubine Xiao, who is driving, was found to be pregnant, and she is the biological mother of Yang Gao, the only concubine of Emperor Yang of Sui. In order to return to the Eastern Capital Palace before the due date, Emperor Yang of Sui had to give up his trip to visit the Yanzhao region. According to the records of the biography of Empress Sui Shu, Emperor Yang of Sui always took Empress Xiao with him whether he was on a tour or a trip, but it is unknown whether the rest of the concubines were driving, but this tour in the third year of Daye can definitely take some of the concubines. The Sui Book Zhou Fashang Biography records that Emperor Yang of Sui once asked his subordinates how to enter the grassland area during his stay in Yulin County, and Zhou Fashang replied that "they formed a phalanx, separated on all sides, and lived in the middle of the six palaces and the homes of hundreds of officials." The six palaces refer to the concubines and concubines, which shows that Emperor Yang of Sui brought other concubines this time.
Emperor Wen of Sui died on July 13 in the fourth year of Renshou (604 AD), Yang Guang, as a son of man, should abide by the rule of not sleeping during the mourning period, so he and the concubine** should also be after the twenty-seven months of filial piety, that is, after September of the second year of the Great Cause (606 AD). Yang Gao was born in the third year of Daye (607 AD), and Emperor Yang of Sui returned to the Eastern Capital in late September, so it can be considered that Yang Gao's birth should probably be born after ***. If the pregnancy is carried out in accordance with the normal October, Concubine Xiao was pregnant with Yang Gao in a certain month at the beginning of the third year of Daye, and was discovered during the northern tour, causing Emperor Yang of Sui to have to change his route.
According to this record, Emperor Yang of Sui's itinerary from the beginning of his northern tour to his arrival in Yulin County was as follows: April ......Bingshen (18th), the car drove north to patrol the ......Jihai (21st), the second Chiganze. The ether prison sacrifices the tomb of the late Taishi Li Mu. On the 9th of May, the Turkic Khan of Qimin sent his son Tuo to the court. Wuwu (10th), more than ten counties in Hebei Ding Nan chiseled Taihang Mountain, reached in the state, to pass the road. On the 18th, the Khan of Qimin sent his brother Viliga to the court. Xinwei (23rd), Qimin Khan sent an envoy to invite himself into the fortress to welcome the public opinion. No ...... allowedJune Xinsi (4th), hunting in the valley. ......Wuzi (11th), Yulin County. Ding You (20th), Qimin Khan came to the court.
On May 10th, the edict was issued to dig the Taihang Mountain to open the Chi Road, and Emperor Yang of the Sui Dynasty should have wanted to return to the Chi Road through this Chi Road after inspecting the Hebei region, and then return to the Eastern Capital in the south. The biography of Sun Sheng, the chief of the Sui book, records that during the northern tour of Emperor Yang of the Sui Dynasty, he sent Changsun Sheng to the Khan of Qimin to explain to him that the emperor would lead the army into the grassland, so that they should not be nervous, and also satirized that Qimin opened up a grassland royal road that spanned east and west, and its scope was "the northern border of Yulin, as for its teeth, and east to Yuji, three thousand miles long, one hundred steps wide", this imperial road extends from Yulin County to the north to its tooth tent, and then eastward to Zhuo County. Through these two records, we can roughly depict the original planned route after arriving at Yulin County, that is, starting from Yulin County to the Qimin Khan's Tooth Tent, then crossing the grassland from west to east, reaching Zhuo County, then inspecting the Hebei region of Shandong, and finally following the newly opened Taihang Mountain Gallop Road into Bingzhou and returning to the eastern capital.
On May 23rd, the Qimin Khan sent an envoy to express his desire to enter the fortress to welcome the royal driver, but Yang Guang did not allow it, combined with the previously mentioned Emperor Yang of Sui had asked Changsun Sheng to go out of the fortress in advance to contact the Qimin Khan, indicating that the original plan at this time was still unchanged, and the patrol team would go out directly and would not stay too much in Yulin County, but on June 20, the Qimin Khan had already met Emperor Yang of Sui in Yulin County. It shows that in this nearly a month, Emperor Yang of Sui made adjustments to the plan of patrolling, and Emperor Yang of Sui's second tour of the north in the fourth year of the Great Cause was actually to continue to complete the planned tour of the Yanzhao area in the previous year.
From the fact that Yang Gao's birth affected Emperor Yang of Sui's patrol, it can be inferred that Emperor Yang of Sui should have no other children. Because judging from his long-term tour every year after that, he really didn't have the time to stay in the harem and accompany his concubines to give birth. Yang Gao's nickname is Ji Zi, Ji Zi's original meaning is the youngest son, this nickname probably reflects the psychology of Emperor Yang of Sui, giving birth to a child is too delayed to go out on patrol.