The Hospitallers, officially known as the Order of St. John, were a medieval religious order founded in the 11th century. Their primary mission was to provide care and shelter for sick and injured pilgrims traveling to the Holy Land. Over time, they evolved into a military order, defending Christian territories during the Crusades while continuing their charitable work. As they gained power and influence, the Hospitallers established hospitals and fortifications across Europe and the Mediterranean. They became known for their distinctive black robes adorned with a white cross. Today, their legacy continues through various charitable organizations and the Sovereign Military Order of Malta.