Castellans of the Polish–Lithuanian Commonwealth were the lowest rank of territorial official who could sit in the Senate of Poland. Their numbers varied over time and with the shifting borders of the Commonwealth. In the Kingdom of Poland and later in the Polish–Lithuanian Commonwealth, Castellans (Polish: Kasztelan) usually deferred to the higher ranking Voivodes (Polish: Wojewoda), excepting three Distinguished Castellans of the cities of Troki, Vilnius, and of Kraków - who ranked higher than the Voivodes.