St. Martin's Cathedral, Utrecht, or Dom Church (Dutch: Domkerk), was the cathedral of the Diocese of Utrecht during the Middle Ages. Once the Netherlands' largest church, dedicated to Saint Martin of Tours, it is one of the country's two pre-Reformation cathedrals, along with the cathedral in Middelburg, Zeeland. It has been a Protestant church since 1580. The building is the one church in the Netherlands that closely resembles the style of classic Gothic architecture as developed in France. All other Gothic churches in the Netherlands belong to one of the many regional variants.