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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), JEAN de Brienne, son of ERARD [II] de Brienne & his wife Agnès de Montbéliard [Montfaucon] ([1170/75]-27 Mar 1237)" at http://fmg.ac/Projects/MedLands/JERUSALEM.htm#JeanBriennedied1237.
- [S336470] Wikipedia, (Online: https://en.wikipedia.org), "John of Brienne" at https://en.wikipedia.org/wiki/John_of_Brienne.
"John of Brienne (c. 1170 - 27 March 1237), also known as John I, was King of Jerusalem from 1210 to 1225 and Latin Emperor of Constantinople from 1229 to 1237. He was the youngest son of Erard II of Brienne, a wealthy nobleman in Champagne. John, originally destined for an ecclesiastical career, became a knight and owned small estates in Champagne around 1200. After the death of his brother, Walter III, he ruled the County of Brienne on behalf of his minor nephew Walter IV (who lived in southern Italy)."
- [S420] The Crusades: The Authoritative History of the War for the Holy Land, Thomas Asbridge, (New York: HarperCollins, 2010), 539.
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