Some important councils have been held in Burgos. A national council took place there in 1078, although opinions differ as to date (the "Boletín de la Academia de la Historia de Madrid", 1906, XLIX, 337, says 1080). This was presided over by the papal delegate, Cardinal Roberto, and attended by King Alfonso VI of Castile. It was convoked for the purpose of introducing into Spain the Roman Rite form of liturgy with the Roman Breviary and Sacramentary, in place of the Mozarabic Rite then in use (which now survives only in Toledo).