6 events the sources record for this year, grouped by region.
What happened
China (1)
Zhang Yichao, military governor of the Guiyi army, recovers Liangzhou with seven thousand troops of Fan and Han. (Zizhi Tongjian (Comprehensive Mirror) 資治通鑑 卷250)
Japan (3)
On the twentieth day of the fifth month, a goryō-e is held at Shinsen-en, a rite to appease the restless spirits of those unjustly killed, Emperor Sudō and Prince Iyo; the four gates of the garden are opened so that the people of the capital may watch. (Nihon Sandai Jitsuroku 卷第七 貞觀5年5月廿日 (원문 7.136))
On the seventeenth day of the sixth month, a great earthquake strikes Etchū and Echigo; valleys and hills change places, water gushes out, houses collapse and many are crushed, and the ground shakes every day after. (Nihon Sandai Jitsuroku 卷第七 貞觀5年6月十七日 (원문 7.152))
The province of Tango reports that 54 persons of the kingdom of Sera, whose language cannot be understood, drifted ashore at Takeno district; 57 Silla people also arrived at Inaba province and were given provisions and sent back. (Nihon Sandai Jitsuroku 卷第七 貞觀5年十七日 (원문 7.292))
Southeast Asia (2)
Nanzhao took the citadel of Fu, and Cai Xi drowned at sea. (Đại Việt sử ký toàn thư 外紀卷之五 「癸未春正月庚午，南詔陷府城，蔡襲」)