 It became the co-cathedral of the diocese of Albenga on 1 December 1973, by decree of the Sacred Congregation of Bishops in the Roman Curia.A diocesan synod was an important meeting of the bishop of a diocese and his clergy, held irregularly at the call of the bishop.Its purpose was (1) to proclaim generally the various decrees already issued by the bishop; (2) to discuss and ratify measures on which the bishop chose to consult with his clergy; (3) to publish statutes and decrees of the diocesan synod, of the provincial synod, and of the Holy See.