In 610 he signed the decree of the King Gundemaro (610-614) which established the province of Toledo by separating territory from that of Cartagena, then under the rule of the Byzantines.

[2] Isidore, who succeeded to the Archbishopric of Seville upon the death of his brother Leander, dedicated to Fulgentius "his lord, the servant of God", his work on the offices of the church, "De ecclesiasticis officiis".

a commission was appointed, and based on arguments taken from Roman law, it was declared that thirty year's undisturbed possession should constitute a legal title.

He is frequently confused in medieval writings with Fulgentius of Ruspe; some works have also been attributed to him, of which, however, no traces remain.

It is said that long after their deaths, a part of the bones of Fulgentius and those of his sister, Florentina, were carried for safety into the Sierra de Guadalupe, and that in the fourteenth century they were found in the village of Berzocana in those mountains.