5 events the sources record for this year, grouped by region.
What happened
China (3)
In the second month of the fifth year of Hakuchi, Takamuku no Fuhito Kuromaro is sent as chief envoy (oshi) to the Great Tang (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 5年 단락132)
In April 654, the Dashi send troops to attack Persia, kill its king Yisihou, and his son Peroz flees to Tokhara. (Zizhi Tongjian (Comprehensive Mirror) 권199 654년 항)
In October 654, 41,000 men of Yongzhou are hired to build the outer wall of Chang'an, finished in thirty days. (Zizhi Tongjian (Comprehensive Mirror) 권199 654년 항)
Japan (1)
In the tenth month of the fifth year, on hearing the emperor is ill, the crown prince goes to Naniwa palace with the Imperial Grandmother and Empress Hashihito; the emperor dies there (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 5年 단락137)