Jincheng (37 BC) — the same event in Samguk Sagi and Samguk Yusa

Samguk Sagi: He built a capital fortress and named it Geumseong.; Samguk Yusa: Silla built Geumseong (entry from the royal chronology table).

What each source says

Samguk Sagi (History of the Three Kingdoms) · 37 BC · 경주시

He built a capital fortress and named it Geumseong. tradition

二十一年，築京城，號曰金城。
Location: 卷01 始祖赫居世居西干 19年

Samguk Yusa (Memorabilia of the Three Kingdoms) · 37 BC · Gyeongju

Silla built Geumseong (entry from the royal chronology table). tradition

甲申築金城
Location: 王曆

Place: 경주

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