Jiankang (424) — the same event in History of the Southern Dynasties, Book of Song and Zizhi Tongjian

History of the Southern Dynasties: Emperor Wen ascended the throne in the Middle Hall and changed the era to Yuanjia.; Book of Song: Emperor Wen left…

What each source says

History of the Southern Dynasties (Nanshi), Annals · AD 424 · 建康

Emperor Wen ascended the throne in the Middle Hall and changed the era to Yuanjia.

皇帝即位于中堂，備法駕入宮
Location: 南史卷2 元嘉1年

Book of Song (Songshu), Annals · AD 424 · 建康

Emperor Wen left Jiangling, in the eighth month visited the Chuning tomb, then ascended the throne in the Zhongtang Hall at Jiankang, renamed the era Yuanjia and granted a general amnesty.

丁酉，謁初寧陵，還於中堂即皇帝位。
Location: 宋書卷5 元嘉1年 8月

Zizhi Tongjian (Comprehensive Mirror) · AD 424 · 建康

The Prince of Yidu ascended the throne in the central hall of Jiankang, becoming Emperor Wen (in the eighth month).

王辭讓數四，乃受之，即皇帝位於中堂
Location: 卷120

Place: 石頭城(建康)

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