Vicariate of San Millán Historical milestone · San Millán de los Caballeros, Esla-Campos, León The town gave its name and its seat to this body delegated by the diocese of Oviedo for church judicial matters, sparing the diocesans of the meseta the journey to Asturias. That year the vicarage moved to Villademor de la Vega. 1737 Photo: Lumais3022 (CC BY-SA 4.0) What to see and do in San Millán de los Caballeros