Canute IV became King of Denmark upon the death of his brother Harald III. Canute IV of Denmark: Canute IV, later known as Canute the Holy or Saint Canute, was King of Denmark from 1080 until 1086. Canute was an ambitious king who sought to strengthen the Danish monarchy, devotedly supported the Roman Catholic Church, and wanted the English throne. Slain by rebels in 1086, he was the first Danish king to be canonized. He was recognized by the Roman Catholic Church as patron saint of Denmark in 1101. April 17, 1080. Wiki link