The uniqueness of the Church of Santalla de Bóveda in western Europe (located quite near the city of Lugo) has led to multiple interpretations about its original purpose: site for baths, nymphaeum or a temple dedicated to Priscillian. It was later reused for Christian purposes, dedicated to Saint Eulalia.
Given how atypical its features are, multiple theories regarding its origin have arisen. It retains the horseshoe arch considered to be the oldest existing in Spanish architecture as a structural element. Due to the quality of its structure and its impressive paintings as well as to its special features and all the controversies surroundings its history it has generated in recent decades, Santalla de Bóveda is one of the most interesting pre-Romanesque monuments that have survived to our day.