of devotion to this Apostle, is neither the cradle nor the principal seat of the order. Two cities contend for the honour of having given it birth, León in the kingdom of that name, and Uclés in Castile. At that time (1157–1230) the royal dynasty was divided into two branches, the rivalry of which tended to obscure the beginnings of the order. The Knights of Santiago had possessions in each of the kingdoms, but Ferdinand II of León and Alfonso VIII of Castile, in bestowing them, set the condition that the seat of the order should be in their respective states. Hence arose long disputes which only ended in 1230 when Ferdinand III, the Saint, united both crowns. Thereafter, Uclés, in Cuenca Province, was regarded as the headquarters of the order; there the grand master habitually resided, aspirants passed their year of probation, and the rich archives of the order were preserved until united in 1869 with the "Archivo Histórico Nacional" of Madrid. The order received its first rule in 1171 from Cardinal Jacinto (later Pope Celestine III), then legate in Iberia of Pope Alexander III. This first Grand Master was Pedro Fernández de Castro, also known as Pedro Fernández de Fuentecalada, a soldier of King Ferdinand II and a former crusader. Unlike the contemporary orders of Calatrava and Alcántara, which followed the severe rule of the Benedictines of Cîteaux, Santiago adopted the milder rule of the Canons of St. Augustine. At León, they offered their services to the Canons Regular of Saint Eligius in that town for the protection of pilgrims to the shrine of St. James and the hospices on the roads leading to Compostela. This explains the mixed character of their order—hospitaller and military—like that of St. John of Jerusalem. They were recognized as religious by Pope Alexander III, whose Bull of 5 July 1175, was subsequently confirmed by more than twenty of his successors. These pontifical acts, collected in the Bullarium of the order, secured them all the privileges and exemptions of other monastic orders. The order comprised several affiliated classes: canons, charged with the administration of the sacraments; canonesses, occupied with the service of pilgrims; religious knights living in community, and married knights. The right to marry, which other military orders only obtained at the end of the Middle Ages, was accorded them from the beginning under certain conditions, such as the authorization of the