The Fourth Council of Toledo occurred in 633. It was held at the church of Saint Leocadia in Toledo.
Under the presidency of the noted St. Isidore of Seville, the council regulated many matters of discipline, decreed uniformity of liturgy throughout the Visigothic kingdom and took stringent measures against baptized Jews who had apostate from the Faith.
At this council, commenced on 5 December 633, all the bishops of Iberian Kingdoms were in attendance. Isidore, though elderly, presided over its deliberations, and was the originator of most of its enactments.
The council expressed with tolerable accuracy the mind and influence of Isidore. The position and deference granted to the Visigothic king were remarkable. The Church is free and independent, yet bound in solemn allegiance to the acknowledged king: nothing is said of allegiance to the Supreme Pontiff in Rome.
It was at the Fourth National Council of Toledo and through his influence that a decree was promulgated commanding and requiring all bishops to establish seminaries in their cathedral cities, along the lines of the school associated with Isidore already existing at Seville. Within his own jurisdiction he had availed himself of the resources of education to counteract the growing influence of Gothic barbarism. His was the quickening spirit that animated the educational movement of which Seville was the centre. The study of Greek and Hebrew as well as the liberal arts, was prescribed. Interest in law and medicine was also encouraged. Through the authority of the fourth council this policy of education was made obligatory upon all the bishops of the kingdom.