Katalin Árpád(házi), princess of Hungary

http://fmg.ac/Projects/MedLands/HUNGARY.htm#_Toc146273223

BÉLA IV 1235-1270, BÉLA V 1304-1308 BÉLA, son of ANDRÁS II King of Hungary & his first wife Gertrud von Andechs-Merano (Nov 1206-Margaret Island, near Buda 2/3 May 1270, bur Esztergom). ... He succeeded his father in 1235 as BÉLA IV King of Hungary. ... m (1218) MARIA Laskarina, daughter of THEODOROS Laskaris Emperor in Nikaia & his first wife Anna Angelina (-16 or 24 Jul 1270, bur Esztergom). ... King Béla IV & his wife had ten children:

• 1. KATHARINA (-Klis Castle 1242, bur Split St Domnius). She died during her family's escape to Dalmatia after the Tatar invasion[924]. The Historia Salonitanorum of Thomas Archdeacon of Split records the death of "Bela rex…due ipsius puelle virgines", while their parents were staying "in Clisse castro", and their burial "in ecclesia beati Domnii"[925].
• 2. MARGIT "the Elder" (-Klis Castle 20 Apr 1242, bur Split St Dominius). ...
• 3. KINGA [Kunigunde] (1224-24 Jul 1292). ... m (1239) BOLESŁAV of Poland, son of LESZKO I "Bialy/the White" Prince of Sandomir and Krakow & his wife Gremislava Ingvarevna of Luck and Dorogobuz [Rurikid] (21 Jun 1226-7 Dec 1279).
• 4. ANNA [Agnes] ([1226/27]-). ... m (1243) ROSTISLAV Mikhailovich ex-Prince of Galich, son of MIKHAIL Vsevolodich Grand Prince of Kiev & his wife Maria Romanovna of Galich ([1225]-1263). After the Mongol invasion, he sought refuge with Béla IV King of Hungary, married the king's daughter, and was appointed Ban of Mačva. He assumed the title ROSTISLAV Tsar of the Bulgarians, and was recognised as such by Hungary[950].
• 5. ELISABETH (1236-24 Oct 1271, bur Kloster Seligenthal). ... m (1250) HEINRICH von Bayern, son of OTTO II "der Erlauchte" Duke of Bavaria & his wife Agnes von Sachsen [Este] (Landshut 19 Nov 1235-Burghausen 3 Feb 1290, bur Kloster Seligenthal).
• 6. KONSTANZA. ... m ([1251/52]%29 LEV Daniilovich of Galich, son of DANIIL Romanovich Grand Prince of Kiev, King of Galich & his first wife Anna Mstislavna of Novgorod ([1228]-1301). He succeed his uncle in 1269 as LEV King of Galich.
• 7. ISTVÁN (Dec 1239-1 Aug 1272). ... He succeeded his father in 1270 as ISTVÁN V King of Hungary. - see below.
• 8. MARGIT "the Younger" (1242-18 Jan 1271). Abbess on the Island of Hares near Ofen, afterwards called Margaret Island, she refused an offer of marriage from Otakar II King of Bohemia[958].
• 9. IOLANDA [Helena] ([1238/44]-16/17 Jun after 1303). ... m (1250) BOLESŁAW of Poland, son of WŁADYSŁAW Prince of Greater Poland & his wife Hedwig [von Pommerellen] (after 1221-13 Apr 1279). He succeeded in 1247 as BOLESŁAW "Poboźny/the Pious" Prince of Kalisch, until 1249 and 1253. He was Prince of Gnesen from 1249/50, and Prince of Greater Poland 1257.
• 10. BÉLA ([1245]-1269, bur Gran [Esztergom]). ... m (24/25 Oct 1264) as her first husband, KUNIGUNDE von Brandenburg, daughter of OTTO III Markgraf von Brandenburg [Askanier] & his wife Beatrix [Bo%C5%BEena] of Bohemia ([1247/52]-after 8 Jun 1292).

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http://en.wikipedia.org/wiki/Maria_Laskarina

Children

Maria and Béla IV of Hungary had ten children:

Catherine of Hungary (c. 1229 – 1242). She died while fleeing with her family following the Battle of Mohi.