Thorkell succeeded Leif some time after 1018 AD[?]. Leif, himself, had previously succeeded his father, Eric the Red, or Eirikr Thorvaldsson[?].
... Security Service[?] Israel ha-Mossad le-Modiin ule-Tafkidim Meyuhadim (Mossad) Sherut ha-Bitachon ha-Klali[?] (Shin Beth) Italy Servizio Informazioni ...