Question: Thorvald Eiriksson was the brother of an explorer who is believed to be the first known European to discover what continent?
Sentence (from "Leif Erikson"): Leif Erikson or Leif Ericson (Old Norse: "Leifr Eiríksson" ; Icelandic: "Leifur Eiríksson"; Norwegian: "Leiv Eiriksson" 970 – c. 1020) was a Norse explorer from Iceland.
Relevant evidence: No