Thorvald Eiriksson was the brother of an explorer who is believed to be the first known European to discover what continent?
Thorvald Eiriksson: Thorvald Eiriksson (Old Norse: "Þōrvaldr Eirikssonr" ; Icelandic: "Þorvaldur Eiríksson" ) was the son of Erik the Red and brother of Leif Erikson. Leif Erikson:  He was the first known European to have discovered continental North America (excluding Greenland), before Christopher Columbus (or possibly Saint Brendan).
North America