Order of Saint Michael of the Wing

The Royal Equestrian and Military Order of Saint Michael of the Wing (Latin: Ordo Equitum Sancti Michaelis sive de Ala, Portuguese: Real Ordem Equestre e Militar de São Miguel da Ala) is a Portuguese Roman Catholic dynastic order that is believed to have been founded in 1147 in the Alcobaça Monastery in Alcobaça, Portugal, by King Afonso I of Portugal, in commemoration of the Conquest of Santarém from the Moors in 1147. The name was chosen in honour of the military Saint Archangel Michael, who assisted in the victory in the shape of a wing in the sky.

Its medieval history including claims of recognition in 1171 by Pope Alexander III, relies heavily on documentation from the 16th to the 18th century. It is classified by the privately operated and funded International Commission on Orders of Chivalry as an "Institution of chivalric character" that was founded as a chivalric order subsequently "revived by the dynastic successor of the founding authority" (2004). The knights were under the jurisdiction of the Abbot of the Cistercian Alcobaça Monastery, and recited the same prayers as its lay brothers along with other military orders during the Reconquista.