Gerard van Tetrode donated land in 1310 in the centre of Haarlem to build St. John's monastery. Later the St. Barbara gasthuis was founded in 1435 by the Hugo van Assendelft, priest of the St. John's monastery, on the south side of this area. The monastery's church and the old Gasthuis doorway are the only parts of the large complex that still exist today. It was a commandry of the Knights of Saint John and is the oldest church in Haarlem after the St. Bavochurch. The order of St. John was disbanded after the Protestant Reformation and the church reverted to the state in 1625. The Haarlem council sold most of the monastery's land, and much of the art during the following years, which added considerably to the wealth of the city.
Though many objects from the church were removed from the city by the Order of St. John before the iconoclasm, many have also survived and are in the collection of the Frans Hals Museum or the Museum Catharijneconvent in Utrecht (which contains the former collection of the Haarlem Bishop museum).
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-  - Website of the North Holland Archives (in Dutch).
- Deugd boven geweld, Een geschiedenis van Haarlem, 1245-1995, edited by Gineke van der Ree-Scholtens, 1995, ISBN 90-6550-504-0
- Van Commanderij van Sint-Jan tot Noord-Hollands Archief. Geschiedenis van het klooster en de kerk van de Ridderlijke Orde van het Hospitaal van Sint-Jan van Jeruzalem in Haarlem, door Wim Cerutti, Haarlem, 2007, ISBN 978-90-8683-011-4