Many Merovingian plans have been reconstructed from archaeology. The description in Bishop Gregory of Tours' "History of the Franks" of the basilica of Saint-Martin, built at Tours by Saint Perpetuus (bishop 460–490) at the beginning of the period and at the time on the edge of Frankish territory, gives cause to regret the disappearance of this building, one of the most beautiful Merovingian churches, which he says had 120 marble columns, towers at the East end, and several mosaics: "Saint-Martin displayed the vertical emphasis, and the combination of block-units forming a complex internal space and the correspondingly rich external silhouette, which were to be the hallmarks of the Romanesque".