1. See also

Ioannes III ({{lang-el|{{lang|grc|Ἰωάννης Γ΄}}}}, Iōannēs G΄) may refer to:

• Patriarch John III of Constantinople (died in 577)
• John III Doukas Vatatzes (c. 1192–1254), Byzantine Emperor
• John III Megas Komnenos (c. 1321–1362), Emperor of Trebizond

See also

• John III (disambiguation)

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