Ioannes IV (, ''Iōannēs D΄'') may refer to:
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Patriarch John IV of Constantinople
John IV of Constantinople (died 2 September 595), also known as ''John Nesteutes'' (, ''Ioannes the Faster''), was patriarch of Constantinople (12 April 582 – 2 September 595). He was the first to assume the title ''Ecumenical Patriarch''. He ...
(died in 595)
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John IV, Archbishop of Ohrid (c. 1088 – 1163/64)
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John IV Laskaris
John IV Doukas Laskaris (or Ducas Lascaris) (; December 25, 1250 – 1305) was the fourth emperor of the Nicaean Empire from August 16, 1258 to December 25, 1261, one of the Greek successor states formed after the Sack of Constantinople by th ...
(1250–c. 1305)
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John IV Megas Komnenos (c. 1403–1459), emperor of Trebizond
See also
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John IV (disambiguation) John IV may refer to:
* Patriarch John IV of Alexandria, Patriarch between 569 and 579
* John IV of Armenia, Catholicos of Armenia between 833 and 855
* John IV of Constantinople (died 595), Patriarch from 582
* Pope John IV (died 642), Pope from 64 ...
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