Died in 1226

Mar 7 William Longespée 3rd Earl of Salisbury an English noble, primarily remembered for his command of the English forces at the Battle of Damme and for remaining loyal to his half-brother, King John. His nickname "Longespée" is generally taken as a reference to his great size and the outsize weapons he wielded
Jul 2 Waleran III Duke of Limburg initially lord of Montjoie, then count of Luxembourg from 1214. He became count of Arlon and duke of Limburg on his father's death in 1221. He was the son of Henry III of Limburg and Sophia of Saarbrücken
Jul 10 Az-Zahir (Abbasid caliph) the Abbasid Caliph in Baghdad from 1225 to 1226. He was the son of an-Nasir, and was named as his successor in 1189. In his short reign, he lowered the taxes, and built a strong army to resist to invasions. He died on 10 July 1226, nine months after his accession, and was succeeded by his son al-Mustansir
Sep 17 William VI Marquess of Montferrat the Marquess of Montferrat from 1203 and pretender to the Kingdom of Thessalonica from 1207.
Oct 3 Francis of Assisi an Italian Catholic friar and preacher. He founded the men's Order of Friars Minor, the women’s Order of Clare, and the Third Order of Saint Francis for men and women not able to live the lives of itinerant preachers, followed by the early members of the Order of Friars Minor, or the monastic lives of the Poor Clares. Though he was never ordained to the Catholic priesthood, Francis is one of the most venerated religious figures in history
Nov 8 Louis VIII of France a Capetian King of France who reigned from 1223 to 1226, he was also disputed King of England from 1216 to 1217. Louis VIII was born in Paris, the son of Philip II and Isabelle of Hainaut from whom he inherited the County of Artois
Nov 15 Frederick of Isenberg a German noble, the younger son of Count Arnold of Altena. His family castle was the Isenburg near Hattingen, Germany
Dec 5 Henry Borwin II Lord of Mecklenburg a member of the House of Mecklenburg, was a Prince of Mecklenburg from 1219 to 1226 and Lord of Rostock.