In 584 the Visigothic king, Liuvigild, incorporated with his state the Kingdom of the Suebi, to which Évora had hitherto belonged.

From the sixth and seventh centuries there remain a few Christian inscriptions pertaining to Évora.

Thenceforth the episcopal list is known from the reign of Reccared (586) to the Islamic invasion (714), after which the succession is quite unknown for four centuries and a half, with the exception of the epitaph of a Bishop Daniel (January, 1100).

Under this king it became suffragan to the archdiocese of Braga, despite the protests of the Archbishops of Compostella, administrators of Mérida.

Portuguese writers have maintained that the first bishop of Évora was St. Mantius, a Roman, and a disciple of Jesus Christ, sent by the Apostles into the Iberian Peninsula as a missionary of the Gospel.