Saint Canute Lavard was a Danish prince. Later he was the first Duke of Schleswig and the first border prince who was both a Danish and a German vassal, a position leading towards the historical double position of Southern Jutland.
He grew up in close contact with the noble family of Hvide, who were later on to be among his most eager supporters. In 1115, his uncle, King Niels of Denmark, placed him in charge of the Duchy of Schleswig (jarl af Sønderjylland) in order to put an end to the attacks of the Slavic Obotrites. During the next fifteen years, he fulfilled his duty of establishing peace in the border area so well that he was titled Duke of Holstein (Hertug af Holsten) and became a vassal of the Holy Roman Empire.
On 7 January 1131, Canute was trapped in the Haraldsted Forest (Haraldsted Skov) near Ringsted in Zealand and murdered by Magnus.
Sources:
Danmarks Konger. Retrieved 1 January 2018.
Dansk biografisk Lexikon. Retrieved May 1, 2018.
"Valdemarstiden 1157-1241". Aarhus University. Retrieved 1 May 2018.
https://en.wikipedia.org/wiki/Canute_Lavard