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- [S336463] Medieval Lands: A prosopography of medieval European noble and royal families, Charles Cawley, (Online: The Foundation for Medieval Genealogy at http://fmg.ac/Projects/MedLands/, 20XX), "KONSTANTIN ROGER FRIEDRICH von Staufen, son of Emperor HEINRICH VI & his wife Constance of Sicily (Iesi, Ancona 26 Dec 1194-Castel Fiorentino near Lucera, Foggia, 13 Dec 1250, bur 25 Feb 1251 Palermo Cathedral)" at http://bit.ly/2hInCIu.
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 550.
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 559.
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 569.
- [S359] The Templars: The Rise and Spectacular Fall of God's Holy Warriors, Dan Jones, (New York: Viking, 2017), 243.
- [S359] The Templars: The Rise and Spectacular Fall of God's Holy Warriors, Dan Jones, (New York: Viking, 2017), 231-33.
- [S359] The Templars: The Rise and Spectacular Fall of God's Holy Warriors, Dan Jones, (New York: Viking, 2017), 236.
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 572.
- [S359] The Templars: The Rise and Spectacular Fall of God's Holy Warriors, Dan Jones, (New York: Viking, 2017), 257.
?Frederick II died of dysentery on December 13, 1250, and was buried in a bright red sarcophagus in Palermo Cathedral. He had spent most of his reign in a long and dizzyingly complex war with the pope and his enemies in Italy, and although he had succeeded where everyone since the First Crusade failed- he had taken back the city of Jerusalem for the Latin Christians- he died having offended the Church so consistently that he had been excommunicated four times and had led many churchmen to the conclusion that he was the devil incarnate.?
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 565.
- [S359] The Templars: The Rise and Spectacular Fall of God's Holy Warriors, Dan Jones, (New York: Viking, 2017), 226.
"Collecting titles was one of Frederick's specialties, and the crown of Jerusalem had come to him by way of a wedding. In 1225 he had married John of Brienne's thirteen-year-old daughter, Isabella, the rightful queen of Jerusalem. As part of the deal Frederick had taken over her father's rights to act as titular ruler of the Latin kingdom. Three years later Isabella bore him a son, whom they named Conrad. Sadly for her, but somewhat fortuitously for Frederick, the girl promptly died of childbed fever, leaving Frederick holding a baby who was next in line to the throne."
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