Jean de Brienne, King of Jerusalem, Latin Emperor of Constantinople [1, 2]
1170 - 1237 (~ 67 years)-
Name Jean de Brienne 
House of Brienne Suffix King of Jerusalem, Latin Emperor of Constantinople Nickname Jean de Candia-Nevers Born ca. 1170 Gender Male Title 4 Sep 1210 Tyre, Lebanon 
King of Jerusalem by right of his wife, Maria of Montferrat. Military 1213 - 1221 The Fifth Crusade - The strategic aim of the Fifth Crusade was to obtain Jerusalem by conquering Egypt. It began with siege of the Upper Nile city of Damietta which was starved into submission 18 months after being invested. The Egyptian defenders simply withdrew deeper into the hinterland. The Crusaders followed, but, unfamiliar with their surroundings, soon found themselves wallowing helplessly in the rising flood of the Nile. Forced to sue for peace, surrender was unconditional. The Latins were left empty-handed.
Crusaders
First (1095–1099); Second (1147–1149); Third or the Kings' Crusade (1189–1192); Forth (1202–1204); Fifth (1213–1221); Sixth (1228); Barons' (1239); Seventh (1248-1254); Eighth (1270); and Ninth (1271-1272).Title 1229 Istanbul, Turkey Latin Emperor-Regent of Constantinople 
Arms of the Latin Empire of Constantinople Died 27 Mar 1237 Person ID I19449 Dickinson Last Modified 9 Nov 2017
Father Érard II de Brienne, Comte de Brienne, d. ca. 1190, Acre, Israel Relationship Birth Mother Agnès de Montbéliard, b. ca. 1150, d. After 1186 (Age ~ 37 years) Relationship Birth Married Before 1166 Family ID F3514 Group Sheet | Family Chart
Family 1 Maria di Monferrato, Queen of Jerusalem, b. 1192, Tyre, Lebanon , d. 1212 (Age 20 years) Married 14 Sep 1210 Children + 1. Isabelle II of of Jerusalem, Queen of Jerusalem, b. 1212, Andria, Italy , d. 25 Apr 1228, Andria, Italy (Age 16 years) [Birth]Last Modified 15 Oct 2017 Family ID F3522 Group Sheet | Family Chart
Family 2 Stephanie of Armenia, b. After 1195, d. 1220, Acre, Israel (Age ~ 24 years) Married Apr 1214 [3] Last Modified 11 Aug 2014 Family ID F3528 Group Sheet | Family Chart
Family 3 Berenguela de Castilla y León, b. 1204, d. 12 Apr 1237 (Age 33 years) Married 1224 Toledo Children + 1. Marie de Brienne, b. Apr 1225, Capua, Caserta, Campania, Italy , d. 5 May 1275, Italy (Age ~ 50 years) [Birth]+ 2. Alphonse de Brienne, Count of Eu, d. 25 Aug 1270, Tunis, Tunisia [Birth]+ 3. Jean de Brienne dit d'Acre, Grand Butler of France, d. 1296 [Birth] 4. Louis de Brienne dit d'Acre, Vicomte de Beaumont, de iure uxoris, d. After 1 Sep 1297 [Birth] Last Modified 11 Aug 2014 Family ID F3112 Group Sheet | Family Chart
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Event Map 
Title - King of Jerusalem by right of his wife, Maria of Montferrat. - 4 Sep 1210 - Tyre, Lebanon 
Title - Latin Emperor-Regent of Constantinople - 1229 - Istanbul, Turkey = Link to Google Earth Pin Legend 
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Sources - [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.
- [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.