John of Brienne
King of Jerusalem and Emperor of Latin Empire of Constantinople (c.1170-1237) · Lived 1158 to 1237 · aged 79
John of Brienne was the 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.
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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 Italy.