The Fourth Council of Toledo was a council of the whole Visigothic church (86 bishops were present) gathered by King Sisenand (631-636)  in 633 and held under the presidency of Isidore of Seville. It is sometimes claimed on stylistic grounds that Isidore was an author of the decrees (Collins 2004: 79).

 

The acts of the Fourth Council of Toledo are transmitted in the 7th-century canonical collection from Spain, the so-called Hispana. Its authorship has been attributed to the Isidore of Seville (it is still accepted by Martinez Diez 1966; other scholars reject this attribution: Munier 1966; Gaudemet 1967: 122-124; Schaferdiek 1967: 144-148; Landau 1968: 406-418). This collection has several recensions: a primitive one, the so-called Isidoriana, lost today; the Juliana recension edited after 681 and attributed to the Julian of Toledo, that adds to the previous recension the acts and canons of the councils from the Fifth Council of Toledo do the Twelfth (in 681); the Vulgata recension edited between 694 and 702 that adds the acts and canons of the councils from the the Thirteenth Council of Toledo up to the Seventeenth held in 694, this recension was the most widespread during the Middle Ages (more bibliography see Kéry 1999: 61-67). The two recensions Iuliana and Vulgata give different titles to the canons of the Fourth Council of Toledo (Martinez Diez 1992: 17-20).