Sabi (538) — the same event in Samguk Sagi and Samguk Yusa

Samguk Sagi: King Seong moved the capital to Sabi and named the country Nam Buyeo.; Samguk Yusa: In spring King Seong of Baekje moved the capital to…

What each source says

Samguk Sagi (History of the Three Kingdoms) · AD 538 · 부여 청산성

King Seong moved the capital to Sabi and named the country Nam Buyeo.

十六年，春，移都於泗沘，國號南扶餘。
Location: 卷26 聖王 16年

Samguk Yusa (Memorabilia of the Three Kingdoms) · AD 538 · Buyeo (Sabi)

In spring King Seong of Baekje moved the capital to Sabi and named the country Nam Buyeo.

百濟聖王二十六年戊午春。移都於泗泚。國號南扶餘
Location: 紀異第二 南扶餘 前百濟

Place: 부여 청산성 · Buyeo (Sabi)

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