10 events the sources record for this year, grouped by region.
What happened
China (6)
Li Chong, Prince of Langya, raised troops at Bozhou, and Qiu Shenji was sent as Marching Commander to suppress him. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷6 垂拱4年 8月)
Li Zhen, Prince of Yue, rose in revolt at Yuzhou and was defeated and killed in the ninth month. Afterwards the imperial clan of Tang was massacred. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷004 則天·中宗 垂拱4年8月)
The Mingtang was torn down and renamed Wanxiang Shengong, and a general amnesty was declared. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷004 則天·中宗 垂拱4年12月)
In August 688, Prince Langye Wang Chong returns to Bozhou; on the day wushen, as he reaches the city gate he is killed by the gatekeeper, and his army is defeated seven days after he raised it. (Zizhi Tongjian (Comprehensive Mirror) 권204 688년 항)
In September 688, Prince Han Yuanxi, Prince Lu Lingkui, Huang Gongxuan and Princess Changle are seized in Dongdu and forced to commit suicide; the city is renamed Hui (虺), and all those loyal to the Tang are killed. (Zizhi Tongjian (Comprehensive Mirror) 권204 688년 항)
Southern Europe (2)
Cædwalla, baptized at Rome by Pope Sergius, died within seven days and was buried at St Peter's; Ine became king of Wessex. (Anglo-Saxon Chronicle Giles/Ingram 1847 A.D. 688 항 (pg657.txt 줄 1904))