Isidore was born probably ca 560, he became the bishop of Seville in 600, and he held that office to his death in AD 636. He wrote several works, among them the De ecclesiasticis officiis composed certainly after AD 598 (the composition of the Moralia in Job by Gregory the Great which are used by Isidore in the books 5 and 6). We cannot establish another terminus ante quem than the year of death of Isidore, although some scholars proposed that the De ecclesiasticis officiis were written before the composition of Chronicon in AD 615 (Lawson 1989: 13*-14*). The argument is based on the assumption that the list of Isidore`s writings composed by Braulio, bishop of Saragossa is ordered chronologically, but, as was demonstrated by its most recent editor (Martin 2006: 64-73), most certainly it is not the case.

Isidore composed the treatise at the request of Bishop Fulgentius of Écija (see the dedicatory letter at the beginning of the book). The De ecclesiasticis officiis is also one of the most important sources for the early Spanish liturgy.