Alexios I Komnenos or Alexius I Comnenus (; ; 1048 – August 15, 1118), Byzantine emperor (1081–1118), was the son of John Komnenos and Anna Dalassena. He was the nephew of Isaac I Komnenos (emperor 1057–1059). The military, financial and territorial recovery of the Byzantine Empire known as Komnenian restoration began in his time.