King Amalric in the context of Agnes of Courtenay

William of Tyre (Latin: Willelmus Tyrensis; c. 1130 – 29 September 1186) was a medieval prelate and chronicler. As archbishop of Tyre, he is sometimes known as William II to distinguish him from his predecessor, William I, the Englishman, a former prior of the Church of the Holy Sepulchre, who was Archbishop of Tyre from 1127 to 1135. He grew up in Jerusalem at the height of the Kingdom of Jerusalem, which had been established in 1099 after the First Crusade, and he spent twenty years studying the liberal arts and canon law in the universities of Europe.

Following William's return to Jerusalem in 1165, King Amalric made him an ambassador to the Byzantine Empire. William became tutor to the king's son, the future King Baldwin IV, whom William discovered to be a leper. After Amalric's death, William became chancellor and archbishop of Tyre, two of the highest offices in the kingdom, and in 1179 William led the eastern delegation to the Third Council of the Lateran. As he was involved in the dynastic struggle that developed during Baldwin IV's reign, his importance waned when a rival faction gained control of royal affairs. He was passed over for the prestigious Patriarchate of Jerusalem, and died in obscurity, probably in 1186.

Baldwin IV (1161–1185), known as the Leper King, was the king of Jerusalem from 1174 until his death in 1185. Baldwin ascended to the throne when he was thirteen despite having leprosy. He launched several attempts to curb the increasing power of the ruler of Egypt, Saladin, though much of his life was marked by infighting amongst the kingdom's nobles. Throughout his reign, and especially at the end of his life, he was troubled by his succession, working to select a suitable heir and prevent a succession crisis. Choosing competent advisers, Baldwin ruled a thriving crusader state, protecting it from Saladin.

Baldwin's parents, King Amalric and Agnes of Courtenay, separated when Baldwin was two. At nine years old, he was sent to be educated by Archbishop William of Tyre. William noticed preliminary symptoms of leprosy, but Baldwin was only diagnosed after he succeeded his father as king. Thereafter, his hands and face became increasingly disfigured. He mastered horse riding despite gradually losing sensation in his extremities and fought in battles until his last years. First, Miles of Plancy ruled the kingdom in Baldwin's name, then Count Raymond III of Tripoli took over until the king reached the age of majority in 1176. Baldwin's mother then returned to court, and he became closer to her and her brother, Joscelin.