A "Hospitaller" refers to a member of a religious order that was originally established to provide care for sick and injured pilgrims in the Holy Land during the Middle Ages. The most notable of these orders is the Order of St. John, also known as the Knights Hospitaller, which was founded in the 11th century. They operated hospitals and offered medical assistance, embodying the principles of charity and service. Over time, the Hospitallers evolved into a military order, defending Christian territories and engaging in the Crusades. They became known for their distinctive black robes adorned with a white cross. Today, the legacy of the Hospitallers continues through various charitable organizations that focus on healthcare and humanitarian aid.