Isaac I Komnenos (or Comnenus) (Greek: Ισαάκιος A' Κομνηνός, Isaakios I Komnēnos) (c. 1007 – 1061) was Byzantine Emperor from 1057 to 1059, and the first reigning member of the Komnenos dynasty. His brief reign saw an attempt to restore the Byzantine Empire’s military capability and reputation.