ull of 7 March 1885, united Alcalá with (effectively merging it into) the diocese of Madridwhich includes the civil province of Madrid, suffragan of the archbishopric of Toledo, which was formally speaking not canonically erected before while its foundation dated from the Spanish Concordat of 1851.
The bishop's residence has since been used for preserving historical archives. It was designed byAlonso Berruguete and has a famous staircase
