 Otherwise the Church of St. Johann Baptist, which had developed out of the Ottonian baptistry, or the Church of St Gertrude (now the Market Church) served as their place of worship.The Reformation had no effect on the Minster.The burgers of the city of Essen, who maintained a long-standing dispute with the order about whether the city was a Free city or belonged to the order, mostly joined the revolution, but the Abbesses and Canons of the order (and therefore the church buildings) remained Catholic.