Ka duba nassin da ke ƙasa sannan ka amsa tambayar daga baya a cikin yare iri ɗaya kamar nassin: Passage: An yi cikakken kewaye da Ottoman na farko na Constantinople a cikin 1422 sakamakon ƙoƙarin da Sarkin Byzantine Manuel II ya yi na tsoma baki a cikin maye gurbin Sultans na Ottoman, bayan mutuwar Mehmed I a 1421.
1422 da kuma