It was convened by Visigothic king Sisenand and took place at the church of Saint Leocadia in Toledo.
Probably under the presidency of the noted 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 relapsed into their former faith.
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.
Through the authority of the fourth council this policy of education was made obligatory upon all the bishops of the kingdom.