A kingdom carved out of the bloody capture of Jerusalem in 1099 nearly came apart within a century, not from the armies waiting across its border, but from the noblemen inside its own court, fighting over who would succeed a king who was slowly dying of leprosy.
The Walls Come Down
The army of the First Crusade broke through the walls of Jerusalem in July 1099. Chroniclers, Christian accounts first and Muslim accounts written later, describe killing in the streets of the city, followed within days by processions of thanksgiving among the men who had taken it.
The death tolls those chroniclers recorded were never a count in the modern sense. Medieval writers rounded upward for effect, and historians today read the numbers as a measure of how brutal the sack felt to the people who wrote it down, not as a body count.
What the crusaders held in the days afterward was not yet a kingdom. It was a conquered city: a garrison of victors camped among a defeated population, with no government in place to run either.
Four Flags on Foreign Ground
Godfrey of Bouillon, duke of Lower Lorraine, became the city’s first ruler after the conquest, founding the Jerusalemite dynasty that would govern the kingdom. Over the following decade, Frankish lords built three more states alongside it: the Principality of Antioch, the County of Edessa, and the County of Tripoli, strung down the eastern Mediterranean coast.
Historians use “Franks” as a catch-all for the people who settled and ruled these states. The word did not point to one nation. It covered newcomers from France, Normandy, Italy, Flanders, and elsewhere in Western Europe, grouped under a single label because, to their neighbors, they looked like one people.
That ruling group was never more than a thin layer over a much larger population. Muslims, Eastern Christians, and Jews who had lived in the region long before 1099 still made up most of the people the Franks now governed.
A Border That Never Closed
For most of the twelfth century, none of the four Frankish states had anything close to a defensible frontier. What they had instead was a scatter of fortified towns and castles, linked by roads that ran through country nobody fully controlled.
Survival depended on treaties and tribute as much as on soldiers. Truces were struck with Muslim neighbors and then broken, by one side or the other; towns changed hands; raiding parties crossed what passed for a border in both directions, year after year.
The system held together only as long as the man on the throne could manage two jobs at once: fight the wars on the frontier, and keep the Frankish nobility, each with his own castle and his own ambitions, from fighting each other instead.
The King Who Was Dying While He Ruled
Baldwin IV was crowned king of Jerusalem on July 15, 1174, at the age of thirteen. He already had leprosy. The diagnosis comes down through the chronicles kept at his court, and it deserves one caution: medieval writers did not diagnose leprosy by the clinical standards doctors use now, and some historians think the description could fit other conditions as well.
For a few years, the disease did not stop him from acting as king. In 1177, Saladin invaded the kingdom, and Baldwin, just sixteen, rode out to meet him alongside the nobleman Raynald of Châtillon. They caught Saladin’s army at Montgisard and drove it back. The victory made Baldwin’s name.
The disease did not stop advancing. By 1183, Baldwin had become, in the plain language of the record, completely incapacitated by his illness. A king who had led an army six years earlier could no longer sit in judgment over his own nobles, or hold a sword, without someone else’s help.
A Throne With No Safe Heir
Leprosy closed off the ordinary fix for a succession problem. Baldwin could not marry, and he would father no children, so the crown would have to pass through his sister, Sibylla. That single fact turned who she married into the kingdom’s central political question years before Baldwin died.
He tried to settle it early. Baldwin hoped to step back from rule once Sibylla married, and in 1176 she wed William of Montferrat. William died the following year, and the plan died with him.
By 1180, two of the kingdom’s senior lords, Raymond III of Tripoli and Bohemond III of Antioch, were maneuvering toward what the record calls a coup. Raymond was no distant figure at court; he was a first cousin of a previous king and had served the kingdom as regent before, which was exactly what made his ambitions dangerous. Baldwin moved first, marrying Sibylla to Guy of Lusignan that same year to shut off the opening the two lords had been working toward.
It settled nothing. Guy reassured the king no more than Raymond and Bohemond had. In 1183, with his body failing, Baldwin made Guy regent, then changed course within the year, stripped him of the position, and had Sibylla’s young son crowned co-king on November 20, 1183, to keep Guy from the throne. Baldwin went further still, trying to pry his sister away from her husband altogether, but Sibylla and Guy simply refused to appear at court and the separation never happened.
Who would actually rule once Baldwin died was still unsettled. Guy had married into a claim on the throne; Sibylla’s son was already crowned and reigning alongside his uncle as co-king; and the lords who had opposed Guy in 1180 were still at court, still against him. The kingdom’s own High Court had even set up a formal mechanism for the dispute, naming a panel of Western European rulers to decide between rival claims if the question ever came to that. Exactly when the rivalry at court turned into open conflict, and which nobleman led which faction, is a longer story than this one covers. What is clear is the timing: while Jerusalem’s court fought over its own succession, Saladin spent these same years building the Ayyubid power base, across Egypt and Syria, that he would turn against the kingdom in the years that followed.