36 events the sources record for this year, grouped by region.
What happened
China (12)
Li Jing crushed the Turks at Dingxiang and sent Empress Xiao, widow of Sui Emperor Yang, and her grandson Zhengdao to Chang'an. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷3 貞觀4年 1月)
At Shuntian Gate, Taizong received the captured Jieli, and the northwestern tribes offered him the title Heavenly Khan. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷3 貞觀4年 4月)
The chieftains of the northwest asked that Emperor Taizong be offered the title Heavenly Khan. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷002 太宗 貞觀4年4月)
From Agni, about two hundred li to the southwest, crossing a small range and two large rivers and going west seven hundred li across a plain, he arrived at the country of Kiu-chi (Kucha). (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Kucha)
Leaving Kucha, about six hundred li west, crossing a small desert, he reached Baluka (Aksu); from east to west about six hundred li, from north to south three hundred li. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Baluka (Aksu))
In January 630, Li Jing, with 3,000 cavalry, is stationed at Eyangling from Mayi, and at night raids Dingxiang and routs the enemy. (Zizhi Tongjian (Comprehensive Mirror) 권193 630년 항)
In the third month of the second year of Emperor Jomei, the Goguryeo envoy Yeon Jabal and the assistant envoy Yakdeok, and the Baekje envoy Eunsol Soja and others, come together to pay tribute (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿三 舒明紀 2年 단락36)
From Qianquan (Thousand Springs), one hundred forty to one hundred fifty li west, he reached the city of Taras; its circumference is eight or nine li, and merchants from many lands gathered there to live. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Taraz)
About two hundred li west he reached the city of Che-shi (Chach, Tashkent); its circumference is over one thousand li, and its western side borders the Ya River. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Chach (Tashkent))
Over one thousand li more to the west he reached the kingdom of Su-tu-li-sse-na (Sutrishna); its circumference is 1,400 to 1,500 li, and its east borders the Jaxartes (Ya) River. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Sutrishna)
About four hundred li west he reached the country of Pu-ho (Bukhara); its circumference is over 1,600 li (numeral unclear in the OCR). (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Bukhara)
Crossing the Oxus River and going south, he reached the kingdom of Ta-mo-sih-teh-ti (Termez); (the various countries of Tokhara are then listed). (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Termez)
From the country of Hun (Kunduz), to the southwest, he reached the kingdom of Fo-kia-lang (Baghlan); about fifty li east to west and about two hundred li north to south. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Baghlan)
Going west he reached the country of Po-ho (Balkh); it is 800 li from east to west and 400 li from north to south, and the Oxus borders it on the north. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Balkh)
The country of Ta-la-kien (Talikan): about five hundred li from east to west and fifty to sixty li from north to south; the capital's circumference is about ten li, and its west borders the frontier of Persia. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Talikan)
Leaving the land of Tokhara and struggling on some six hundred li, he reached the kingdom of Fan-yen-na (Bamiyan); about two thousand li from east to west and three hundred li from north to south. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Bamiyan)
About five hundred li northwest of Tsing Lake, he reached a city on the banks of the Su-yeh River; its circumference is six or seven li, and merchants of the neighboring countries gathered there to live. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Suyab)
About forty to fifty li south of the previous city, he reached the country of Nu-chih-kien (Nujkend); its circumference is about one thousand li. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Nujkend)
About one thousand li southeast of Chach lies the country of Fei-han (Ferghana); its circumference is about four thousand li, and mountains surround it on all sides. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Ferghana)
From the previous country, to the southeast, lies the country of Mi-mo-ho (Maymurgh); its circumference is 400 to 500 li, and it lies in the middle of a valley. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Maymurgh)
About two hundred li west he reached the country of Ho-han (Ho-han); the next is Pu-ho, four hundred li further west. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Ho-han)
Leaving the capital and entering the snowy mountain slopes to the southwest, he reached the country of Jui-mo-to (Jumadha?); about fifty to sixty li from east to west and about one hundred li from north to south. (Xuanzang, Great Tang Records on the Western Regions Si-yu-ki (Beal 1884) vol.1 Bk I Jumadha)