Thorfinn Karlsefni (Old Norse Þórfinnr Karlsefni), explorer and trader (born c. 980–95 CE in Iceland; year of death unknown). Born Thorfinn Thordarson, this Icelandic aristocrat and wealthy merchant ship owner led one of the Norse expeditions to Vinland, located in what is now Atlantic Canada. He is usually referred to by his nickname, Karlsefni, meaning “the makings of a man.” Karlsefni appears in several historical sources. A long passage in The Saga of the Greenlanders is devoted to him, and he is the chief subject of The Saga of Erik the Red. There are also short accounts in the Old Norse manuscripts known as the Arni Magnusson codex 770b and Vellum codex No. 192.