Pedzisa mashoko anotevera: Muna 1394, mambo weOttoman Bayezid I akakomba Constantinople. Manuel akasiya guta racho muna 1399 kuti afambe muWestern Europe achitsvaka rubatsiro rwechiuto, uye akapa John VII basa rokushumira somutongi muConstantinople, achitarisira kudzivirirwa kwaro. Pasinei zvapo nezvokupomerwa kuti akanga arangana nevaOttoman, John VII akabata guta racho nokuvimbika kwenguva yose yorwendo rwaManuel rwemakore matatu nehafu, achiramba kuripa kuna Bayezid. Kutyisidzirwa kweConstantinople kwakaguma nekukundwa kwaBayezid kurwisa vaTimurids pa
Hondo yeAnkara muna 1402. Mushure mekurwa uku, John VII akaita chibvumirano chakanaka nemumwe wevanakomana vaBayezid, Süleyman Çelebi, akaona kuti guta rakakosha reTesaronika, rakarasikirwa nevaOttoman muna 1387 nekuda kwezviito zvaManuel, rakadzoserwa kutonga kwehumambo. Pasinei nebasa raJohn VII rokuvimbika, Manuel akamudzinga achinyadziswa paakadzoka muna 1403, uye vaviri vacho vakanga vavazve vavengi. Kurwisana uku kwakaratidza kuva kwechinguvana, sezvo ivo vakayananiswa mwedzi mishomanene gare gare uye chibvumirano chitsva chakaitwa, umo John VII akabvumirwa kutora Thessalonica uye akabvumirwa nezita rose roumambo. Kubva muna 1403 kusvikira parufu rwake muna 1408, John VII nokudaro akatonga muTesaronika sa"Mambo weTesaronika yose", ane imba yake youmambo yakaparadzana. VaTesaronika vaimuona somutongi anokwanisa, uye basa rake rokutarisira nyaya dzechechi yomunzvimbo iyoyo uye kuvandudza masvingo eguta racho rakamuita kuti ayeukwe zvakanaka.