Boniface I, Marquess of Montferrat the independent city communes of the Lombard League. Boniface's eldest brother, William, had died in 1177, soon after marrying Sibylla, the heiress presumptive to the Kingdom of Jerusalem. In 1179, the Byzantine emperor Manuel I Comnenus offered his daughter Maria Porphyrogenita as a bride to one of the sons of William V. Since Boniface, like his older brother Conrad, was already married, and Frederick was a priest, the youngest brother, Renier, married her instead, only to be murdered along with her during the usurpation of Andronicus. In 1183, Boniface's nephew Baldwin V was crowned co-king of Jerusalem. William V went
Baldwin V of Jerusalem kingdom, preceding Sibylla's claim. Baldwin V, aged 5, was crowned co-king. The succession crisis also prompted a mission to the west to seek assistance: in 1184, Patriarch Eraclius, along with Roger de Moulins, Grand Master of the Knights Hospitaller, and Arnaud de Toroge, Grand Master of the Knights Templar, travelled throughout the courts of Europe. Eraclius offered the kingship to both Philip II of France and Henry II of England: the former was the son of Louis VII, a first cousin of Baldwin V's father; the latter was a first cousin of Baldwin IV and Sibylla, and had promised to