The patriarchal dioceses included Friuli, Carnia, Cadore, the southern part of Carinthia, the Carniola, and southern Styria in nowadays’ Slovenia.
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In 606 at Grado two patriarchs were elected, who started a double series of bishops. In 628 Fortunatus I moved to Cormòns under Lombard protection.
Following the Justinian’s edict, the schism brought to profound tearing: the bishopric of Aquileia broke its communion with Rome and the Church of the Empire