Who Am I?

I am the son of a king and queen who were saints.

I died young at only 24, seven years before my father. So I never actually assumed the throne.

I was canonized together with my father.

Shortly before my birth another father and son carried my surname; they were both explorers. In fact the son converted a whole sparcely populated continent to the Catholic Faith. He was converted by a fellow countryman, King Olaf, who was also a saint. That son eventually converted his equally famous father.

Indirectly the whole western hemisphere carries my name.