Maassluis (Dutch pronunciation: [maːˈslœys] (listen)) is a city in the western Netherlands, in the province of South Holland. The municipality had a population of 33,567 in 2021 and covered 10.12 km2 (3.91 sq mi) of which 1.64 km2 (0.63 sq mi) was water. It received city rights in 1811. Maassluis was founded circa 1340 as a settlement next to a lock (in Dutch: sluis) in the sea barrier between the North Sea and Rotterdam. Originally Maeslandsluys, it was part of Maesland. In 1489 the settlement was sacked. During the Eighty Years' War, Philips of Marnix, lord of Sint-Aldegonde, started to build a defense wall but before its completion, the Spanish captured it in 1573 and Philips of Marnix was taken prisoner. A year later Maeslandsluys was looted by mutinous Spanish troops. More information...
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