Some lives defy all categories. That of Baldwin IV of Jerusalem is one of them. Crowned at thirteen, a leper from the age of nine, blind and paralysed at the end, he governed the most threatened kingdom in Christendom for more than a decade with a clarity and courage that none of his healthy contemporaries could match. And when he died, barely twenty-four years old, he left the throne in the hands of the only people capable of losing everything — and they did.
The dynasty: five kings named Baldwin
When Godfrey of Bouillon conquered Jerusalem in July 1099 at the head of the First Crusade, he refused the title of King of the Holy City — he would not wear a crown of gold where Christ had worn a crown of thorns. It was his brother Baldwin of Boulogne who, without such scruples, crowned himself Baldwin I in the year 1100, founding the dynasty that would rule the Kingdom of Jerusalem for nearly a century.
He was followed by Baldwin II (1118–1131), his cousin and one of the pillars of the young kingdom, who welcomed Hugues de Payens and his first nine knights into the Temple and saw the Templar Order born under his reign. Then came Baldwin III (1143–1163), who conquered Ascalon from the Egyptian Fatimids, and finally Baldwin IV (1174–1185), the most extraordinary of them all. Five kings with the same name. One single obsession: keeping alive the impossible dream of a Christian kingdom in the heart of Islam.
A boy, a diagnosis, a destiny
Baldwin IV was born in 1161, son of King Amalric I and Agnes of Courtenay. He was a sharp, intelligent and physically gifted child — his tutor, the historian William of Tyre, described him as an exceptionally brilliant pupil. It was William himself who discovered, when Baldwin was about nine years old, that the boy felt no pain when his right arm was pinched. Physicians were not slow to confirm the diagnosis: leprosy.
The disease would advance inexorably. First the right arm, then both hands, then the face. In time Baldwin would lose sight in one eye, then the other. In his final years he governed lying on a litter, his body wrapped in bandages, unable to ride a horse. And yet, for more than a decade, he was the man who kept the greatest military leader of medieval Islam at bay.
Montgisard, 1177: the miracle in the desert
On 25 November 1177, Saladin — the Ayyubid sultan who had reunified Egypt and Syria and dreamed of reconquering Jerusalem — was advancing northward with an army of twenty-five thousand men, convinced that the Christian kingdom lay defenceless. Baldwin IV was sixteen years old, his body already marked by leprosy, and he had fewer than five hundred knights and a few thousand infantry.
What happened at the Battle of Montgisard is one of the most extraordinary episodes in the history of the Crusading Wars. The young leper king, who could barely hold the reins with his bandaged hands, personally led the charge. The Saracen vanguard was surprised and destroyed. Saladin had to flee on horseback, leaving his dead on the field. He lost more than eight thousand men. The Kingdom of Jerusalem survived another day.
Saladin, who was a man of honour as well as a military genius, publicly acknowledged the defeat. And, according to the chronicles, he never forgot the young king who had defeated him in the desert with half his forces.
Governing with death overhead
What makes Baldwin IV truly unique is not merely the victory at Montgisard. It is his capacity to govern, with complete lucidity, a kingdom in a permanent state of war, surrounded by quarrelling nobles and newly arrived crusaders from Europe who understood nothing of local politics — all while his body progressively disintegrated.
Baldwin was fully aware that he would have no children. Leprosy and the treatments of the age made marriage and succession impossible. He knew he would die young and that the kingdom needed a succession plan. He therefore poured all his political energy into managing that succession — a problem that would ultimately destroy what he had built.
In 1180, in a moment of political weakness, he consented to the marriage of his sister Sibylla to an ambitious French noble freshly arrived from overseas: Guy de Lusignan. It would prove to be the most catastrophic decision of his reign.
Sibylla, Guy de Lusignan and the collapse
Sibylla of Jerusalem was intelligent, beautiful and unfortunately in love with Guy de Lusignan — a man described by contemporary chroniclers with devastating unanimity: handsome, chivalrous in appearance, and entirely unfit for government or war. The barons of the kingdom despised him. Baldwin himself eventually acknowledged his mistake and tried to annul the marriage and remove Guy from power, without fully succeeding.
Baldwin IV died in the spring of 1185, aged twenty-four, blind and consumed by disease. He had named as regent his nephew, the child Baldwin V, Sibylla's son from a previous marriage, under the tutelage of Count Raymond III of Tripoli. But Baldwin V would die barely a year later, in 1186. And then Sibylla, now a free widow, made a decision that would change history: she crowned herself Queen of Jerusalem, and immediately afterwards crowned Guy de Lusignan as king consort. The barons who opposed Guy could do nothing — the kingdom was Sibylla's, and Sibylla wanted Guy.
The Horns of Hattin: the end of the dream
On 4 July 1187, on the volcanic hills beside the Sea of Galilee known as the Horns of Hattin, Saladin destroyed the crusader army in the most decisive battle in the history of the Kingdom of Jerusalem. Guy de Lusignan had made a series of military decisions so catastrophically wrong that modern historians still debate whether they sprang from incompetence or treachery: he marched the entire army across arid terrain in the height of summer, without access to water, straight into the trap Saladin had set for him.
The True Fragment of the Holy Cross — the kingdom's most sacred relic, carried into battle as a symbol of divine protection — was captured by the Muslims. The Grand Master of the Templars, Gerard of Ridefort, was taken prisoner. Guy de Lusignan was captured and brought before Saladin, who offered him water and spared his life. That same day, however, Saladin had personally drawn his scimitar and beheaded the French lord Raynald of Châtillon — the lord of Kerak, guilty of attacking an Arab merchant caravan and murdering Saladin's own sister during the raid. It was a blood debt the sultan had been waiting years to settle, and the battle of Hattin had delivered it on a silver platter. Three months later, on 2 October 1187, Saladin entered Jerusalem.
What Baldwin IV had defended with his shattered body for more than a decade — the impossible equilibrium, the constant negotiation, the calculated resistance — was lost in a single summer day through the vanity and incompetence of the man his sister had chosen as king. The lesson history offers is cruel and direct: sometimes the sickest man in the room is the only one who thinks clearly.