The Order of Alcántara is a Roman Catholic military order founded in the 12th century in Spain. Its primary purpose was to protect the Christian territories during the Reconquista, a period of conflict between Christian and Muslim kingdoms. The order was named after the town of Alcántara, which means "the bridge" in Arabic, symbolizing its role in connecting and defending Christian lands. Members of the Order of Alcántara took vows of poverty, chastity, and obedience, and they were known for their distinctive green and white habits. The order played a significant role in various military campaigns and was granted lands and privileges by the Spanish crown, contributing to its influence in medieval Spain.