Siege of Jerusalem (1187) in the context of "Patriarch of Constantinople"

The Third Crusade (1189–1192) was an attempt led by King Philip II of France, King Richard I of England and Emperor Frederick Barbarossa to reconquer the Holy Land following the capture of Jerusalem by the Ayyubid sultan Saladin in 1187. For this reason, the Third Crusade is also known as the Kings' Crusade.

It was partially successful, recapturing the important cities of Acre and Jaffa, and reversing most of Saladin's conquests, but it failed to recapture Jerusalem, which was the major aim of the Crusade and its religious focus.

The Estoire d'Eracles ("History of Heraclius") is an anonymous Old French translation and continuation of the Latin History of Deeds Done Beyond the Sea by William of Tyre. It begins with recapture of Jerusalem by the Roman emperor Heraclius in AD 630, from which it takes its name, and continues down to 1184. The continuation recounts the history of the Crusader states from Saladin's capture of Jerusalem in 1187 down to 1277.

The translation was made between 1205 and 1234, possibly in Western Europe. Several times the text of the translation was changed and the manuscripts preserve different versions of William's text. The continuations were added to the translation between 1220 and 1277. There are two different versions of the first continuation, covering the years 1185–1225. Both reflect the political attitudes of the Crusader aristocracy. There are 49 surviving manuscripts of the Eracles. Of these, 44 contain a first continuation drawn from the Chronicle of Ernoul and five (the so-called Colbert–Fontainebleau manuscripts) contain a different version. Twelve of the manuscripts contain a unique continuation for the years 1229–1261 drawn from the independent work known as the Rothelin Continuation.

The Battle of Hattin took place on 4 July 1187, between the Crusader states of the Levant and the forces of the Ayyubid sultan Saladin. It is also known as the Battle of the Horns of Hattin, due to the shape of the nearby extinct volcano of that name.

The Muslim armies under Saladin captured or killed the vast majority of the Crusader forces, removing their capability to wage war. As a direct result of the battle, Muslims once again became the eminent military power in the Holy Land, re-capturing Jerusalem and most of the other Crusader-held cities and castles. These Christian defeats prompted the Third Crusade, which began two years after the Battle of Hattin.

The Kingdom of Jerusalem, also known as the Crusader Kingdom, was one of the Crusader states established in the Levant immediately after the First Crusade. It lasted for almost 200 years, from the accession of Godfrey of Bouillon in 1099 until the fall of Acre in 1291. Its history is divided into two periods with a brief interruption in its existence, beginning with its collapse after the siege of Jerusalem in 1187 and its restoration after the Third Crusade in 1192.

The original kingdom lasted from 1099 to 1187 before being almost entirely overrun by the Ayyubid Sultanate under Saladin. Following the Third Crusade, it was re-established in Acre in 1192. The re-established state is commonly known as the "Second Kingdom of Jerusalem" or alternatively as the "Kingdom of Acre" after its new capital city. Acre remained the capital for the rest of its existence, even during the two decades that followed the Crusaders' establishment of partial control over Jerusalem during the Sixth Crusade, through the diplomacy of Emperor Frederick II.

The region of Palestine is part of the wider region of the Levant, which represents the land bridge between Africa and Eurasia. The areas of the Levant traditionally serve as the "crossroads of Western Asia, the Eastern Mediterranean, and Northeast Africa", and in tectonic terms are located in the "northwest of the Arabian Plate". Palestine itself was among the earliest regions to see human habitation, agricultural communities and civilization. Because of its location, it has historically been seen as a crossroads for religion, culture, commerce, and politics. In the Bronze Age, the Canaanites established city-states influenced by surrounding civilizations, among them Egypt, which ruled the area in the Late Bronze Age. During the Iron Age, two related Israelite kingdoms, Israel and Judah, controlled much of Palestine, while the Philistines occupied its southern coast. The Assyrians conquered the region in the 8th century BCE, then the Babylonians c. 601 BCE, followed by the Persian Achaemenid Empire that conquered the Babylonian Empire in 539 BCE. Alexander the Great conquered the Persian Empire in the late 330s BCE, beginning Hellenization.

In the late 2nd-century BCE Maccabean Revolt, the Jewish Hasmonean Kingdom conquered most of Palestine; the kingdom subsequently became a vassal of Rome, which annexed it in 63 BCE. Roman Judea was troubled by Jewish revolts in 66 CE, so Rome destroyed Jerusalem and the Second Jewish Temple in 70 CE. In the 4th century, as the Roman Empire adopted Christianity, Palestine became a center for the religion, attracting pilgrims, monks and scholars. Following Muslim conquest of the Levant in 636–641, ruling dynasties succeeded each other: the Rashiduns; Umayyads; Abbasids; the semi-independent Tulunids and Ikhshidids; Fatimids; and the Seljuks. In 1099, the First Crusade resulted in Crusaders establishing of the Kingdom of Jerusalem, which was reconquered by the Ayyubid Sultanate in 1187. Following the invasion of the Mongol Empire in the late 1250s, the Egyptian Mamluks reunified Palestine under its control, before the region was conquered by the Ottoman Empire in 1516, being ruled as Ottoman Syria until the 20th century largely without dispute.

Egypt was repeatedly invaded from 1163 to 1169 by King Amalric of Jerusalem, who wished to strengthen its position in the Levant by taking advantage of the weakness of the Fatimid Caliphate.

The invasions began as part of a succession crisis in the caliphate, which began to crumble under the pressure of Muslim Syria ruled by the Zengids and the Christian Crusader states. While one side called for help from the emir of Syria, Nur ad-Din Zengi, the other called for Crusader assistance. As the war progressed, however, it became a war of conquest. A number of Syrian campaigns into Egypt were stopped short of total victory by the aggressive campaigning of King Amalric. Even so, the Crusaders generally speaking did not have things go their way, despite several sackings. A combined Byzantine–Crusader siege of Damietta failed in 1169, the same year that Saladin took power in Egypt as vizier. In 1171, Saladin became sultan of Egypt and the crusaders thereafter turned their attention to the defence of their kingdom, which, despite being surrounded by Syria and Egypt, held for another 16 years. Later crusades tried to support the Kingdom of Jerusalem by targeting the danger that was Egypt, but to no avail.

The king or queen of Jerusalem was the supreme ruler of the Kingdom of Jerusalem, a Crusader state founded in Jerusalem by the Latin Catholic leaders of the First Crusade, when the city was conquered in 1099. Most of them were men, but there were also five queens regnant of Jerusalem, either reigning alone suo jure ("in her own right"), or as co-rulers of husbands who reigned as kings of Jerusalem jure uxoris ("by right of his wife").

Godfrey of Bouillon, the first ruler of the Kingdom of Jerusalem, refused the title of king choosing instead the title Advocatus Sancti Sepulchri, that is Advocate or Defender of the Church of the Holy Sepulchre. In 1100 Baldwin I, Godfrey's successor, was the first ruler crowned as king. The crusaders in Jerusalem were conquered in 1187, but their Kingdom of Jerusalem survived, moving the capital to Acre in 1191. Crusaders re-captured the city of Jerusalem in the Sixth Crusade, during 1229–1239 and 1241–1244.

Ernoul was a squire of Balian of Ibelin who wrote an eyewitness account of the fall of Jerusalem in 1187. This was later incorporated into an Old French history of Crusader Palestine now known as the Chronicle of Ernoul and Bernard the Treasurer (French: La Chronique d'Ernoul et de Bernard le trésorier), often abbreviated Ernoul-Bernard. The chronicle covers the years from 1100 until 1228. A few manuscripts copied for Bernard, treasurer of Corbie Abbey, extend the narrative down to 1232.