La Iglesia de Santa Maria la Antigua is very old. Although they have found Roman ruins beneath the church, parts of the church you can see were erected in the 12th century. Other components of the church are comparatively new. As it turns out, the church is built on a not-so-stable foundation (one source says it is built too close to a river - but it is built right next to the cathedral, which doesn't have similar problems). Like most churches of that era, they had pieces added and renovations made to it. But this is one of the oldest church (even on average for the pieces) in Valladolid.