5 events the sources record for this year, grouped by region.
What happened
China (2)
Liang Luoren, a man of Shuofang, killed Liang Shidu and surrendered, ending the northern warlord regime. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷002 太宗 貞觀2年4月)
In April 628, when the Turks come with a great army to rescue Liang Shidu, Chai Shao and others meet them dozens of li short of Shuofang, fight bravely, rout them, and surround Shuofang. (Zizhi Tongjian (Comprehensive Mirror) 권192 628년 항)