The Westerkerk is a Reformed church within Dutch Protestant Calvinism in central Amsterdam, Netherlands. It lies in the most western part of the Grachtengordel neighborhood, next to the Jordaan, between the Prinsengracht and Keizersgracht.

Hendrick de Keyser was a Dutch sculptor, merchant in Belgium bluestone, and architect who was instrumental in establishing a late Renaissance form of Mannerism changing into Baroque. Most of his works appeared in Amsterdam, some elsewhere in the Dutch Republic. He was the father of Pieter and Thomas de Keyser and Willem, and the uncle of Huybert de Keyser, who became his apprentices and all involved in building, decoration and architecture.