 Ramba uchiverenga ndima ino - Humambo hweByzantium hwakanga hwava kutonga nyika dzakawanda dzinotaura chiGiriki kubvira munguva dzekare, asi hwakanga hwava kuderera pamusana pokupinda kwevaMuslim veArabia nevaSeljuk veTurkey uye hwakanga hwaderedzwa zvakaipisisa nekupambwa kweConstantinople nevaLatin Crusadersmuna 1204. Kugadzwa kwenyika dzechiKaturike dzechiLatin muvhu reGreek, uye kurwisana kwevaGreek veOrthodox veByzantium navo, kwakatungamira mukubuda kwechiratidzo chechiGiriki chakasiyana. Umambo hweByzantium hwakadzorerwa nedzinza raPalaiologos muna 1261, asi hwakanga huri mumvuri wezvawakanga uri kare, uye hondo dzevagari vemo dzisingaperi nokurwiswa nedzimwe nyika muzana remakore rechi14 zvakaita kuti hupere. Somugumisiro, chikamu chikuru cheGirisi zvishoma nezvishoma chakava rutivi rweUmambo hweOttoman mukupera kwezana remakore rechi14 uye kutanga kwezana remakore rechi15, kuchiguma nokuwa kweConstantinople muna 1453, kukunda kweDuchy yeAthens muna 1458, uye kweDespotate yeMorea muna 1460. 