Pyongyang (427) — the same event in Samguk Sagi and Samguk Yusa

Samguk Sagi: King Jangsu moved the capital to Pyongyang.; Samguk Yusa: King Jangsu of Goguryeo moved the capital to Pyongyang fortress.

What each source says

Samguk Sagi (History of the Three Kingdoms) · AD 427 · 평양시

King Jangsu moved the capital to Pyongyang.

十五年，移都平壤。
Location: 卷18 長壽王 15年

Samguk Yusa (Memorabilia of the Three Kingdoms) · AD 427 · Pyongyang

King Jangsu of Goguryeo moved the capital to Pyongyang fortress.

丁卯移都平壤城
Location: 王曆

Place: 平壤

Show on the map — open Samguk Sagi (History of the Three Kingdoms)