Thorkell succeeded Leif some time after 1018 AD[?]. Leif, himself, had previously succeeded his father, Eric the Red, or Eirikr Thorvaldsson[?].
... proper Ainu name, Karafuto (樺太) or Karaftu, was restored to the island by the Japanese during their possession of its southern part (1905-1945). Sakhalin is ...