The initial design of the portico was for two towers, but it was finally decided to build only one.

The construction of the Gothic and Renaissance style tower began in 1508 under the direction of Rodrigo Gil de Hontañón based on plans by Juan de Badajoz and was completed in 1587. Pedro de Buyeres, Pedro de la Tijera and Juan de Cerecedo also collaborated to a greater or lesser extent during its construction.