Ioannes III ( el, , ''Iōannēs G΄'') may refer to: *

Patriarch John III of Constantinople John Scholasticus or Scholastikos (c. 503 – 31 August 577) was the 32nd patriarch of Constantinople from April 12, 565 until his death in 577. He is also regarded as a saint of the Eastern Orthodox Church. Life He was born at Sirimis, in the r ...

(died in 577) *

John III Doukas Vatatzes John III Doukas Vatatzes, Latinized as Ducas Vatatzes ( el, Ιωάννης Δούκας Βατάτζης, ''Iōannēs Doukas Vatatzēs'', c. 1192 – 3 November 1254), was Emperor of Nicaea from 1221 to 1254. He was succeeded by his son, known ...

(c. 1192–1254), Byzantine Emperor *

John III Megas Komnenos John III Megas Komnenos or Grand Comnenus ( el, , ''Iōánnēs Mégas Komnēnós''; – 1362) was emperor of Trebizond from September 4, 1342, to May 3, 1344. He was a son of Emperor Michael of Trebizond (who had reigned for a day in 1341) and A ...

(c. 1321–1362), Emperor of Trebizond

See also