Sankt Knuds Kirke is one of Denmark's most important Gothic churches — a high, narrow, brick-built basilica completed in the 15th century on the site of an earlier wooden church. The gilded triptych altarpiece by the Lübeck-trained sculptor Claus Berg (around 1520) is one of the finest late-medieval altarpieces in Scandinavia, with hundreds of carved figures.
The crypt holds the relics of Saint Canute (Knud the Holy), Denmark's only royal saint, in a glass casket. He was killed in front of the cathedral in 1086 by rebellious peasants and canonised soon afterward. The cathedral became a major pilgrimage site as a result and was a key reason for the city's medieval prominence.