The west gallery organ of the Martinikerk in Groningen dates from the 15th century; it took its present form in the 18th century when it was expanded by Arp Schnitger, his son Franz Caspar Schnitger and his successor Albertus Antonius Hinsz. It has 52 speaking stops on three manuals and pedal, and is one of the largest and most famous baroque organs in Northern Europe.