7 events the sources record for this year, grouped by region.
What happened
China (2)
Emperor Yizong died at the age of 41 at Xianning Hall, and Prince Bao, Yan, was made crown prince. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷19上 咸通14年 7月)
Dazaifu reports that on the eleventh day of the third month, two unidentified ships with sixty people drifted ashore at Koshiki district in Satsuma. Their leader Choe Jongjwa says he is a Bohai man, but a Silla man is suspected of falsely claiming it; one ship fled. By imperial decree they are to be interrogated. (Nihon Sandai Jitsuroku 卷第廿三 貞觀15年廿七日 (원문 23.111))
Dazaifu reports by post horse that the Bohai men Choe Jongjwa and others drifted ashore at Amakusa district in Higo. The Tang interpreter Chang Gunchung interrogates them and confirms they are Bohai's envoys bound for Tang; they are given clothing and provisions and treated as envoys of friendly neighbors. (Nihon Sandai Jitsuroku 卷第廿四 貞觀15年八日 (원문 24.18))
The province of Mutsu reports that captured barbarians fill the province and rebel often, so officials and people live in fear. Following the precedent of Musashi province, permission is given to enshrine five bodhisattva statues in the provincial temple. (Nihon Sandai Jitsuroku 卷第廿四 貞觀15年12月七日 (원문 24.112))
On the twenty-second day of the twelfth month, Dazaifu reports that on the twenty-fifth day of the ninth month last year 32 Silla people drifted ashore at Tsushima in one ship and were confined at the Kōrokan. By imperial edict, since Silla has not given up its evil poison, they are to be thoroughly investigated before being sent back. (Nihon Sandai Jitsuroku 卷第廿四 貞觀15年12月廿二日 (원문 24.127))
Western Europe (1)
The army went toward Northumbria, wintered at Torksey in Lindsey, and the Mercians again made peace. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 873 항 (pg657.txt 줄 2815))