 The Collegiate Church of S. Siro in San Remo, administered by a college of Canons, had once belonged to the diocese of Albenga, but it was handed over to the diocese of Ventimiglia.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.