Chengdu (552) — the same event in Book of Liang and History of the Southern Dynasties

Book of Liang: Xiao Ji, Prince of Wuling, claimed the imperial title in Shu and changed the era name to Tianzheng.; History of the Southern…

What each source says

Book of Liang (Liangshu), Annals · AD 552 · 成都

Xiao Ji, Prince of Wuling, claimed the imperial title in Shu and changed the era name to Tianzheng.

益州刺史、新除假黃鉞、太尉武陵王紀竊位於蜀,改號天正元年
Location: 卷5 承聖元年 四月

History of the Southern Dynasties (Nanshi), Annals · AD 552 · 蜀

Yizhou Governor Prince Wuling Ji proclaimed himself emperor in Shu, using the era name Tianzheng.

益州刺史、新除假黃鉞、太尉武陵王紀僭位於蜀,年號天正
Location: 南史 卷8 承聖1年

Place: 益州

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