*Bela IV King of Hungary
born November 1206 Esztergom, Komarom-Esztergom, Hungary
died 3 May 1270

father:
*Andras II King of Hungary
born 1176 Esztergom, Komarom-Esztergom, Hungary
died 21 September 1235

mother:
*Gertrude Countess of Andechs
born about 1185 Andechs, Oberbayern, Bavaria
died 28 September 1213
married 1203

siblings:
Maria Princess of Hungary born 1204 Esztergom, Komarom-Esztergom, Hungary died 1237
Erzsebet Princess of Hungary born 1207 Esztergom, Komarom-Esztergom, Hungary died 19 November 1231
Kalman Prince of Hungary born 1208 Esztergom, Komarom-Esztergom, Hungary died after 11 April 1241 Segesd, Somgoy, Hungary
Andrus Prince of Hungary born about 1210 Esztergom, Komarom-Esztergom, Hungary died about 12 June 1245

spouse:
*Maria Laskarina Princess of Byzantine Empire
born about 1206 Nicaea, Bursa, Byzantium
died 1270

children:
Kunigunda Princess of Hungary born 1224 Buda, Pest, Hungary died 24 July 1292
Margit Princess of Hungary born about 1226 Buda, Pest, Hungary died 1242
Anna Princess of Hungary born about 1227 Buda, Pest, Hungary died 1274
Katalin Princess of Hungary born about 1229 Buda, Pest, Hungary died 1242
Erzsebet Princess of Hungary born about 1226 Buda, Pest, Hungary died 24/25 October 1271
Konstancia Princess of Hungary born about 1237 Buda, Pest, Hungary
Ilona Princess of Hungary born about 1238 Buda, Pest, Hungary died 6 March 1297/98
*Istvan V King of Hungary born about 1240 Buda, Pest, Hungary
died 1 August 1272 Buda, Pest, Hungary
Margit Princess of Hungary born 1242 Buda, Pest, Hungary died 18 January 1270/71
Bela Prince of Hungary born about 1243 Buda, Pest, Hungary died 1269
Szabina Princess of Hungary born about 1245 Buda, Pest, Hungary

biographical and/or anecdotal:
Went head to head with the Mongols and lost.
"March of the Barbarians".
notes or source:
LDS
ancestry.com