suru verb (special), intransitive verb
make a capital; have as capital
Used for a ruler or government establishing or maintaining a city as the capital. Often appears in historical or political contexts.
桓武天皇は平安京に都した。
Emperor Kanmu made Heian-kyō his capital.
この国は長く京都に都していた。
This country had Kyoto as its capital for a long time.