King Béla too soon fell terminally ill. On his deathbed, he asked his grandson-in-law King Ottokar II of Bohemia to assist his wife, daughter and partisans in case they were forced to leave Hungary by his son. Béla died on Rabbits' Island on 3 May 1270. Dying at 63, he exceeded in age most members of the House of Árpád. He was buried in the church of the Franciscans in Esztergom, but Archbishop Philip of Esztergom had his corpse transferred to the Esztergom Cathedral. The Minorites only succeeded in regaining Béla's remains after a long lawsuit. King Béla IV of Hungary left to his son, to Stephen, a prosperous, a rebuilt, a fortified kingdom in 28 years. Béla successfully concluded the alliance between the houses of Árpád and Anjou with a mutual marriage contract. In the last year of his life, in December 1269, Abbot of Monte Cassino Bernhard Ayglerius visited Hungary as the envoy of King Charles I of Anjou. He reported enthusiastically to his lord, the foreign, impartial contemporary envoy saw Béla's court as follows: "The Hungarian royal house has incredible power, its military forces are so large that nobody in the East and the North dares even budge if the triumphant and glorious king mobilizes his army. Most of the countries and princes of the North and East belong to his empire by kinship or conquest." Family Béla's wife, Maria Laskarina was born in 1207 or 1208, according to historian Gyula Kristó. She died in July or August 1270. Their first child, Kunigunda, was born in 1224, four years after her parents' marriage. She married Boleslaw the Chaste, Duke of Cracow in 1246. A second daughter, Margaret followed Kunigunda in about 1225; she died unmarried before 1242. The third daughter of Béla, Anna was born around 1226. She and her husband, Rostislav Mikhailovich were especially favored by Béla. Her great-grandson, Wenceslaus—a grandson of her daughter, Kunigunda by King Ottokar II of Bohemia—was King of Hungary from 1301 to 1305. Béla's fourth daughter, Catherina died unmarried before 1242. Next, Elisabeth was born; she was given in marriage to Henry XIII, Duke of Bavaria in about 1245. Her son, Otto was crowned King of Hungary in 1305, but was forced to leave the country by the end of 1307. Béla's sixth daughter Constance married, around 1251, Lev Danylovich, second son of Prince Daniil Romanovich of Halych. Béla's seventh daughter,