A member of the Polish nobility (szlachta) of the Junosza coat of arms, he also held the position of the Great Crown Chancellor from 1735 to 1746.
As a politician he was engaged in the movement that wanted to reform the failing political system of the Commonwealth.
Załuski was a corresponding member of Societas eruditorum incognitorum in terris Austriacis, the first learned society in Habsuburg Austria.
Along with his brother Józef Andrzej Załuski, the bishop of Kiev, he co-founded Załuski Library, one of the largest 18th-century collections of books in the world.
You can help Wikipedia by expanding it.This article about a Polish Catholic bishop or archbishop is a stub.