“Pre-Romanesque” is a confusing architectural term. The style didn’t appear until centuries after the Romans, so it’s not exactly pre-Roman at all. Instead, the term refers to buildings which pre-date the Romanesque architecture of medieval times, named so because of its rounded Roman arches.
Further adding to the confusion is that the term “Pre-Romanesque” doesn’t have a concrete definition. There are no defining characteristics that relate the Pre-Romanesque architecture of Spain to that of, say, Croatia. It’s just a generic designation for any Western architecture that predates the Romanesque.
In other words, “Pre-Romanesque Architecture” has nothing whatsoever to do with Romans, nor with an architectural style. Maybe I’m slow, but that confused me for weeks.
The only Pre-Romanesque architecture in Spain is found in Asturias, since the rest of the peninsula was under the rule of the Moors (with their non-Western Mozarabic style). In and around Oviedo, there are many well-preserved examples, including the Santa María del Naranco and San Miguel de Lillo. A less-visited church lays about 30km south of the city: Santa Cristina de Lena.
High up on a hill with an incredible view of the valley, the ancient church was constructed in the year 852. Those kind of dates still blow my mind: more than the length of my life squared. There’s clearly been a lot of reconstruction on the Santa Cristina, but the custodian pointed out many elements which are original, including a 7th-century Visigoth lattice which was worked into the decoration. This was a church built for the use of the king, with a royal tribune above the entranceway, and we found engravings of shells, indicating that it must have been (and probably still is) a minor stop on the Camino de Santiago.
It’s hard to find, but this church is definitely worth tracking down for fans of architecture. There’s also a Pre-Romanesque interpretation center in the nearby train station. Personally, the more of these buildings I saw, the more interesting they became.