 The fourth period belongs to the reign of Alfonso III (866–910), where a strong Mozarabic influence arrived to Asturian architecture, and the use of the horseshoe arch expanded.A fifth and last period, which coincides with the transfer of the court to León, the disappearance of the kingdom of Asturias, and simultaneously, of Asturian Pre-Romanesque.Between the end of the 9th century and the beginning of the 11th century, a number of churches were built in the Northern Christian kingdoms.