Сигизмунд Кейстутович
The current castle, towering over the Styr River, was built mostly in the 1340s, although some parts of the earlier walls were used. It repelled sieges by numerous potentates, including Casimir the Great (1349), Jogaila (1431), and Sigismund Kęstutaitis (1436). It was there that the Lutsk Conference of 1429 took place, attended by Emperor Sigismund, Vasily II of Moscow, Jogaila, Vytautas the Great, and the voivode of Wallachia.