The world in 665 AD — what happened that year

6 events the sources record for this year, grouped by region.

What happened

In 665, Buyeo Yung, Commandant of Ungjin, and Silla's King Beopmin are made to settle their old grudges, and in August (Imja day) they form an alliance at Ungjin castle. (Zizhi Tongjian (Comprehensive Mirror) 권201 665년 항)
In December 665 (Byeongjin day), the emperor leaves Lingyan and reaches the foot of Mount Tai; on the south of the mountain he sets up a round altar, on the summit a Dengfeng altar, and on Mount Sheshou a Jiangxian square altar. (Zizhi Tongjian (Comprehensive Mirror) 권201 665년 항)

The king, Liu Renyuan and Buyeo Yung swore an oath at Chwiri Mountain in Ungjin, slaughtering a white horse. (Samguk Sagi (History of the Three Kingdoms) 卷06 文武王 5年)
King Munmu went to Ungjin fortress, built an altar with Buyeo Yung and sealed a pact by slaughtering a white horse. (Samguk Yusa (Memorabilia of the Three Kingdoms) 紀異第一大宗春秋公)

In the eighth month of year 4, Dalsol Dapbon Chuncho was sent to build a castle in Nagato, and Ogure Hokuru and others were sent to Tsukushi to build the castles of Ono and Ki. (Nihon Shoki (Chronicles of Japan) 日本書紀卷第廿七天智紀 4年 단락61)

During a plague the East Saxons returned to idols, but through the zeal of Jaruman, bishop of Mercia, they were turned back. (Bede, Ecclesiastical History of the English People Bede HE 3.30)