<nowiki>Juan IV Ducas Láscaris; IV. Jóannész nikaiai császár; Joan IV.a Laskaris; Ioannes IV; Johannes IV.; John IV Laskaris; ژان چهارم لاسکاریس; Йоан IV Дука Ласкарис; IV. İoannis Laskaris; ヨハネス4世ラスカリス; Johannes IV Laskaris; יוחנן הרביעי לסקריס, קיסר האימפריה הביזנטית; Ioannes IV Ducas Lascares; Johannes IV. Dukas Laskaris; 요한네스 4세; John IV Laskaris; John IV Laskaris; Jan IV. Dukas Laskaris; Ivan IV Laskaris; Giovanni IV di Nicea; يوحنا الرابع لاسكاريس; Jean IV Lascaris; Іаан IV Ласкарыс; Ivan IV. Duka Laskaris; Ján IV. (Nikajské cisárstvo); Johannes IV Laskaris; Иоанн IV Ласкарис; Ioan al IV-lea Laskaris; Chuan IV Ducas Lascaris; Johannes IV Doukas Laskaris; Ioannes IV Laskaris; Joan IV Ducas Làscaris; دؤردونجو ژان لاسکاریس; Johannes IV Laskaris; Јован IV Ласкарис; 约翰四世·拉斯卡里斯; Juan IV Laskaris; João IV Láscaris; იოანე IV ლასკარისი; Ioannes IV Laskaris; Jan IV Laskarys; Johannes IV Dukas Laskaris; Janis IV Laskaris; João IV Láscaris; Johannes IV Laskaris; John IV Laskaris; Јован IV Ласкарис; Xoán IV Ducas Láscaris; يوحنا الرابع لاسكاريس; Ιωάννης Δ΄ Λάσκαρης; Іоанн IV Ласкаріс; imperatore bizantino; ニカイア帝国の最後の皇帝; empereur de Nicée de 1258 à 1261; monark i kejsardömet Nicaea; heerser uit Byzantijnse Rijk (1250-1305); Kaiser von Byzanz; Nikaian keisari (1258–1261); 13th-century emperor of Nicaea; emperador de Nicea; byzantský císař; nikaiai császár; Giovanni IV di Bisanzio; Giovanni IV Lascaris; Johannes IV Dukas Laskaris; Joan IV Làscaris; Joan IV Lascaris; Johannes IV. Laskaris; Ioannes IV Doukas Laskaris; ژان چهارم; Johannes IV Doukas Laskaris; Ιωάννης Δ΄ Δούκας Λάσκαρις; Јован IV Дука Ласкарис; Ioan al IV-lea al Bizanţului; Ioan al IV-lea al Bizanțului; ヨアニス4世ラスカリス; イオアンネス4世ラスカリス; Ioannes IV Doukas Laskaris; IV. Yannis Laskaris; Ιωάννης Δ' Λάσκαρης; Ιωάννης Δ'; Ιωάννης Δ΄ Λάσκαρης Βατάτζης; Johannes IV Lascaris; Johannes IV van Byzantium; Johannes IV Laskaris; Iohannes IV Ducas Lascares; John IV, Emperor of Constantinople; John IV Doukas Laskaris; John IV Laskaris; IV. İoannes; Ioannes 4. Laskaris; Xoán IV Láscaris; Juan IV Ducas Lascaris; Jan IV. Laskaris; Johannes IV Lascaris</nowiki>
John IV Laskaris 13th-century emperor of Nicaea ![](https://cdn.statically.io/img/upload.wikimedia.org/wikipedia/commons/thumb/1/1e/John_IV_Laskaris_miniature.jpg/230px-John_IV_Laskaris_miniature.jpg) Johannes IV Lascaris. |
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Date of birth | 25 December 1250 İznik |
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Date of death | 1305 (statement with Gregorian date earlier than 1584) |
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Mother | - Elena Asenina of Bulgaria
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