Lyon Cathedral is a Roman Catholic church located on Place Saint-Jean in central Lyon, France. The cathedral is dedicated to Saint John the Baptist, and is the seat of the Archbishop of Lyon. Begun in 1180 on the ruins of a 6th-century church, it was completed in 1476. Despite its long construction time, it has a relatively consistent architectural style. In 1998, the buil…Lyon Cathedral is a Roman Catholic church located on Place Saint-Jean in central Lyon, France. The cathedral is dedicated to Saint John the Baptist, and is the seat of the Archbishop of Lyon. Begun in 1180 on the ruins of a 6th-century church, it was completed in 1476. Despite its long construction time, it has a relatively consistent architectural style. In 1998, the building, along with other historic sites in the center of Lyon, was inscribed on the UNESCO World Heritage List.