From a hospital to an order
The Hospitallers, formally the Order of the Hospital of Saint John of Jerusalem, began as a charitable institution. A hospital in Jerusalem, traditionally said to have been founded by merchants from the Italian city of Amalfi, looked after sick and poor pilgrims in the decades before the First Crusade. After the crusaders took the city in 1099, the hospital’s work expanded, and it attracted gifts of land and money from Europe. The man usually named as its early leader is Brother Gerard.
In 1113 a papal bull took the community under the protection of the pope, which allowed it to function as an independent religious order with its own leadership. The point worth holding onto is that it started as a charity. The later military role grew out of the dangerous conditions in the Crusader States, not out of a plan from the first day. The order’s original work is covered in more depth in the articles on its hospitals and its charity.
Taking up arms
By the middle of the twelfth century the Hospitallers had a military side. The leader often credited with guiding that shift is Raymond du Puy, who headed the order after Gerard. Historians debate how quickly and deliberately the change happened, and sources are thin on the early decades. By the 1140s the order was receiving castles on the frontier, and its knights were fighting alongside the armies of the Kingdom of Jerusalem. Unlike the Templars, who were created with a military purpose, the Hospitallers held on to their medical and charitable duties even as they took on defense. Both functions stayed part of the order’s identity.
The twelfth and thirteenth centuries
The Hospitallers were deeply involved in the wars of the crusader era. They were present at the Battle of Hattin in 1187, which led to the loss of Jerusalem, and many of their men were reportedly executed after the battle. They rebuilt and continued to operate from coastal and inland strongholds. The order’s growing wealth came from estates across Europe, organized into local houses that sent revenue and recruits east.
As Muslim forces gradually recaptured crusader territory, the Hospitallers lost their major castles one by one. When the siege of Acre ended in 1291, the order, like the others, had to leave the mainland. It withdrew to Cyprus, which was a temporary base rather than a permanent solution. Their fortresses, the heart of their military role, are described in a separate article.
Rhodes
The order’s next move was a bold one. Rather than dissolve or merge, as some in Europe suggested after the crusader defeat, the Hospitallers looked for an island they could govern themselves. They captured Rhodes in a campaign that began around 1306 and was completed by about 1310. The island, then part of the Byzantine world but held loosely, gave the order territory, a harbor and a naval role. From Rhodes they fought pirates and raided Muslim shipping, and they built strong fortifications, including a walled city.
The timing helped them. In 1312, after the Templars were suppressed, the pope assigned much of the Templar property to the Hospitallers. Actual possession often took years and was contested by local rulers, and the Hospitallers did not receive everything, but the transfer still strengthened their position.
Standing against the Ottomans
For roughly two centuries the Hospitallers on Rhodes were a Christian outpost near the Anatolian coast, in a region increasingly dominated by the rising Ottoman state. The order survived several attacks. A major siege in 1480 failed to take the island. In 1522 a much larger Ottoman force under Sultan Suleiman besieged Rhodes for months, and the Hospitallers eventually negotiated a surrender and left. The wider story of Ottoman expansion in the eastern Mediterranean helps explain why Rhodes, however well defended, was hard to hold for good.
Malta
After some years without a permanent home, the order was granted the islands of Malta, along with Gozo, in 1530 by the Holy Roman Emperor Charles V. The arrangement carried a symbolic annual payment and conditions, among them a role in defending the nearby coast of North Africa. The Hospitallers, now often called the Knights of Malta, built fortified harbors and a new capital. In 1565 they withstood a major Ottoman siege, an event seen as a turning point in the Mediterranean struggle, although the Ottoman navy remained a force for many years.
The order’s rule over Malta continued until 1798, when Napoleon Bonaparte seized the islands on his way to Egypt. The knights lost their territory, but the order did not disappear. Today organizations descended from it, both Catholic and Protestant, continue charitable and medical work, including ambulance and hospital services in various countries. The details of those modern groups are outside the medieval story, but they show how the original charitable purpose has lasted far longer than the fortresses.
What stands out
Three features distinguish the Hospitallers. The first is their flexibility: they adapted from hospital to garrison to naval power. The second is institutional survival: while the Templars were suppressed, the Hospitallers kept a continuous existence for centuries. The third is the unusual double role of soldier and caregiver, something that makes the order different from the Teutonic Knights and the other military orders of the crusading world.