Isabella II of Jerusalem

Isabella II (121225 April 1228), also known as Yolande of Brienne, was a princess of French origin who became monarch of Jerusalem.
Infant Queen.
Isabella II was born in Andria, in the southern Italian Kingdom of Sicily. She was the only child of Maria of Montferrat, Queen of Jerusalem, and John of Brienne. Maria was the daughter of Queen Isabella I of Jerusalem by her second husband Conrad I, and heiress, on her mother's death, of the Kingdom of Jerusalem.
Maria died shortly after giving birth to Isabella II in 1212, possibly by puerperal fever. Because of this, Isabella II was proclaimed Queen of Jerusalem when she was only a few days old. Because her father John did not have a direct claim on the throne, he ruled as regent.
Marriage with Frederick II.
During a meeting between John of Brienne, the Pope Honorius III and Frederick II in the city of Ferentino in 1223, Isabella's fate was decided: Frederick accepted to finally go to the Crusade, but only as the legitimate King of Jerusalem, and this was only possible if he agreed to take the young Queen Isabella II as his wife (by this time, Frederick was a widower). This was planned by the Pope, who hoped by this bond to attach the Emperor firmly to the Sixth Crusade. The betrothal was confirmed, but the Emperor still delayed his departure until August 1225, when he and Isabella were married by proxy in the City of Acre. Days later, Isabella II was crowned as Queen of Jerusalem.
Isabella arrived in Italy with twenty galleys sent by Frederick II to bring her to her father and married in person to Frederick II in the cathedral of Brindisi, on 9 November 1225. During the ceremony, Frederick declared himself King of Jerusalem and immediately saw to it that his new father-in-law John of Brienne, the current regent of Jerusalem, was dispossessed and his rights transferred to him. The contemporary chronicles described the exotic wedding celebrations, which took place in the Castle of Oria, and the indignant reaction of her father John of Brienne, now without royal authority.
Death.
After the wedding, Isabella was kept in seclusion by her husband, in Palermo. Aged 14, in November 1226, she gave birth to her first child, a daughter (referred to by some sources as Margaret); the baby died in August 1227. Isabella died 4 May after giving birth to her second child, a son, Conrad, in Andria, Bari, on 25 April 1228. She was buried in the Andria Cathedral.