Jiankang (502) — the same event in Book of Liang, History of the Southern Dynasties, Book of Wei and 1 more

Book of Liang: Xiao Yan ascended the throne at the southern altar in Jiankang and founded the Liang dynasty; Emperor He of Qi had abdicated.; History…

What each source says

Book of Liang (Liangshu), Annals · AD 502 · 建康

Xiao Yan ascended the throne at the southern altar in Jiankang and founded the Liang dynasty; Emperor He of Qi had abdicated.

高祖卽皇帝位於南郊
Location: 卷2 天監元年

History of the Southern Dynasties (Nanshi), Annals · AD 502 · 建康

Xiao Yan ascended the throne at the southern suburbs and founded Liang; in the Taiji Front Hall he held a great amnesty and changed the era (Tianjian).

夏四月丙寅，皇帝即位于南郊，設壇柴燎告天曰
Location: 南史卷6 天監1年

Book of Wei (Weishu), Imperial Annals · AD 502

Xiao Yan overthrew Qi and founded the Liang dynasty.

是月，蕭衍又廢其主寶融而僭立，自稱曰梁。
Location: 魏書卷8·景明三年

Zizhi Tongjian (Comprehensive Mirror) · AD 502 · 建康

Liang Prince Xiao Yan ascends at Nanjiao as Emperor Wu after Qi's Emperor He (Xiao Baorong) yields the throne; a general amnesty is declared and the era renamed.

丙寅，梁王即皇帝位於南郊，大赦，改元
Location: 卷145

Place: 石頭城(建康)

Show on the map — open Book of Liang (Liangshu), Annals