Manuel I Komnenos wani sarki ne na Byzantine na karni na 12 wanda ya yi sarauta a kan wani muhimmin sauyi a tarihin Byzantium da Bahar Rum.Mulkinsa ya ga fure na ƙarshe na maido da Komneniya, lokacin da Daular Rumawa ta ga farfadowar ƙarfin soja da ƙarfin tattalin arzikinta, kuma ta sami farfaɗowar al'adu.Ko da yake ya maido da daularsa zuwa ga daukakar da ta gabata a matsayin mai iko na duniyar Bahar Rum, Manuel ya bi manufofin kasashen waje mai kuzari da kishi.A cikin wannan tsari ya yi ƙawance tare da Paparoma Adrian IV da kuma yammacin sake dawowa.Ya mamaye
Masarautar Norman ta Sicily , ko da yake bai yi nasara ba, kasancewar shi ne sarkin Roma na Gabas na ƙarshe da ya yi ƙoƙarin sake mamaye yammacin Bahar Rum.An gudanar da tafiyar
Crusade ta biyu mai hatsarin gaske a cikin daularsa.Manuel ya kafa kariyar Byzantine akan Jihohin Crusader na
Outremer .Da yake fuskantar ci gaban musulmi a kasa mai tsarki, ya kafa hujja da Masarautar Kudus kuma ya shiga cikin mamayewar
FatimidMasar a hade.Manuel ya sake fasalin taswirar siyasa na yankin Balkan da gabashin Bahar Rum, inda ya sanya masarautun Hungary da Outremer karkashin mulkin Byzantine tare da yin kamfen da mugun nufi ga makwabtansa a yamma da gabas.Duk da haka, a ƙarshen mulkinsa, nasarorin da Manuel ya samu a gabas sun lalace ta hanyar shan kashi mai tsanani a Myriokephalon, wanda a babban bangare ya haifar da girman kai na kai hari ga wani matsayi na
Seljuk mai karewa.Ko da yake Rumawa sun murmure kuma Manuel ya kammala zaman lafiya mai fa'ida da Sultan Kilij Arslan II, Myriokephalon ya zama na ƙarshe, ƙoƙarin da daular ta yi bai yi nasara ba don dawo da yankin Anatoliya daga Turkawa.Helenawa suna kira ho Megas, an san Manuel ya ƙarfafa aminci ga waɗanda suka bauta masa.Ya kuma bayyana a matsayin gwarzon tarihin da sakatarensa, John Kinnamos ya rubuta, wanda a cikinsa ake danganta kowane irin nagarta da shi.Manuel, wanda dangantakarsa da 'yan Salibiyya na yamma ya rinjaye shi, ya ji daɗin sunan "sarki mai albarka na Konstantinoful" a sassan duniya na Latin kuma.Masana tarihi na zamani, duk da haka, ba su da sha'awar shi.Wasu daga cikinsu sun ce wannan gagarumin iko da ya yi ba nasa ba ne, na daular da yake wakilta ne;suna kuma jayayya cewa, tun da ikon mulkin mallaka na Byzantine ya ragu da bala'i bayan mutuwar Manuel, abu ne kawai na dabi'a don neman musabbabin wannan raguwa a mulkinsa.