 In the Middle Ages , a number of churches and monasteries were built in the town . St Canute 's Church ( Skt . Knuds Kirke ) , now the cathedral , dates from the end of the 13th century and was closely connected to the Benedictine Order . The town 's other old churches are St Mary 's ( Vor Frue Kirke ) and St John 's ( Skt . Hans Kirke ) with its adjacent monastery . Greyfriars Monastery ( Gråbrødre Kloster ) was founded by the Franciscans in 1279 . 
