The Kingdom of Jerusalem's first ruler was Godfrey of Bouillon. He and his successors expanded the borders of their kingdom, covering approximately where Israel, Palestine, and Lebanon are today.
This included the city of Tyre, the birthplace of William II of Tyre c.1130. Though growing up in Jerusalem, he went back to Europe to study Liberal Arts and canon law in the universities (where he knew a man named Hilary who studied Classical literature while William was there). He studied theology in Paris under Peter Lombard (whose writings became the standard for theological education) and Bologna (probably around the same time as Peter of Blois, who was the same age).
William came back to Jerusalem in 1165, where King Amalric I appointed him ambassador to the Byzantine Empire, and sent Amalric's son, the future king Baldwin IV, to live with and be tutored by William. Baldwin had been born in 1161, so was quite young. Over time, William was to notice something very different about the boy (but more on that later).
When Amalric died in 1174, William became Chancellor to the still-very-young Baldwin, appointed by the regent, Raymond III of Tripoli. William was also made Archbishop of Tyre. In 1179, William led the Jerusalem delegation to the Third Lateran Council, called by Pope Alexander, that declared education should be made free to those who could not afford it, and that expanded the Truce of God.
William also wrote. His account of the Third Lateran and a history of the Islamic states have not survived, but his Latin work called alternately Historia rerum in partibus transmarinis gestarum ("History of Deeds Done Beyond the Sea") or Historia Ierosolimitana ("History of Jerusalem") was translated into French soon after his death and then into other languages, so has survived.
William's status was connected to his relationship with the king. There had been a brief regency after Amalric died, and Baldwin did not become king in his own right until 1176. There was some debate about his accession to the throne, but he was the only appropriate option at the time. What was the cause of the concern? It had been clear since his childhood that there was something different about him, something wrong, actually, and it would not necessarily prevent him from being king, but it would prevent him from extending the dynasty.
Tomorrow we'll look at Baldwin IV and the sad case of his illness that William noticed even when Baldwin was a child—especially when he was a child.