His first wife, Maria of Montferrat, Queen of Jerusalem, died in 1212. He married Stephanie of Armenia two years later.
Stephanie was the only child of the King of Armenia, Leo I. She was born sometime after 1195, and so was perhaps a teenager when she married John in April of 1214. Stephanie's step-mother, Sibylla (her biological mother, Isabelle of Antioch, died when Stephanie was 10), was a daughter of Queen Isabella I of Jerusalem, who was the mother of Maria of Montferrat.
Stephanie gave birth to a son, John. When Stephanie's father was on his deathbed, he changed his choice of successor from his great-nephew (Raymond-Roupen) to his daughter Stephanie. Understandably, there was hostility over the succession, with John of Brienne supporting his wife's claim (which could give him title to King of Armenia). Pope Honorius ruled that Stephanie and her infant son should be the successors to Armenia. Stephanie and her son both died shortly after, and the pope ruled in favor of Raymond-Roupen.
Back to John of Brienne, who now went looking for another wife (and was not busy trying to win the kingdom of Armenia). He found her in Berengaria of León, a daughter of King Alfonso IX of León and Berengaria of Castile. John, in his travels to drum up support for the Holy Land, had visited the famous shrine at Santiago de Compostela. At the time he was still considered King of Jerusalem, and Alfonso offered John his daughter Sancha by his first wife, who would become Queen of León. John instead chose Berengaria, a daughter of Alfonso's second wife. Sancha was 33, Berengaria was 20.
Berengaria and John had children who survived. Marie of Brienne you will read about below. Alfonso went on the Seventh Crusade and became (through marriage) Count of Eu. Louis became Viscount of Beaumont when he married Agnes of Beaumont. John II of Brienne married Marie de Coucy, who was free to marry because her first husband, King Alexander II of Scotland, had died.
In 1229, the throne of the Latin Empire in the East was inherited by Baldwin II of Constantinople, who was only 12. The nobles of the empire decided John de Brienne should become a regent for Baldwin. John was made co-emperor in April 1229; Berengaria was titled Latin Empress Consort. Their daughter, Marie of Brienne, was betrothed to Baldwin; the marriage, in 1234 when she was 10 and he was 17, made Marie Latin Empress. Their child was featured in this post on royal "hostages."
John of Brienne died on 27 March 1237 in Constantinople; he was about 60 years old. Berengaria died 16 days later. She was buried in a marble coffin at Santiago de Compostela. Some records state that he became a Franciscan before he died. His tomb is unknown, but an anonymous troubadour of the 13th century says he was buried in the Hagia Sophia.
The political and genealogical twists and turns of Europeans in the Holy Land could dominate any history blog, but it's time to turn away and head west. Berengaria's father, Alfonso IX, may have held the first Parliament in Western Europe, predating the English result of Magna Carta by decades. Let's take a look at that next time.