Isaac I Komnenos was a Byzantine Emperor who ruled from 1057 to 1059. He was a member of the prominent Komnenos family and came to power after leading a successful rebellion against the previous emperor, Constantine X Doukas. His reign was marked by efforts to restore stability to the Byzantine Empire, which was facing internal strife and external threats. During his short rule, Isaac I focused on military reforms and improving the empire's finances. However, he struggled with political opposition and eventually abdicated the throne in favor of Constantine X Doukas's son, Michael VI. After his abdication, he retired to a monastery, where he lived until his death.