Merovingian art is the art of the Merovingian dynasty of the Franks, which lasted from the 5th century to the 8th century in present-day France, Benelux and a part of Germany. The advent of the Merovingian dynasty in Gaul in the 5th century led to important changes in the field of arts. Sculpture regressed to be little more than a simple technique for the ornamentation of sarcophagi, altars and ecclesiastical furniture. On the other hand, gold work and the new medium of manuscript illumination integrated "barbarian" animal-style decoration, with Late Antique motifs, and other contributions from as far as Syria or Ireland to constitute Merovingian art. Architecture The unification of the Frankish kingdom under Clovis I (465–511) and his successors, corresponded with the need for the building of churches, and especially monastery churches, as these were now the power-houses of the Merovingian church. Plans often continued the Roman basilica tradition, but also took influences from as far away as Syria and Armenia. In the East, most structures were in timber, but stone was more common for significant buildings in the West and in the southern areas that later fell under Merovingian rule. Most major churches have been rebuilt, usually more than once, but 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". A feature of the basilica of Saint-Martin that became a hallmark of Frankish church architecture was the sarcophagus or reliquary of the saint raised to be visible and sited axially behind the altar, sometimes in the apse. There are no Roman precedents for this Frankish innovation. The Saint Peter's church in Vienne is the only surviving one. A number of other buildings, now lost, including the Merovingian foundations of Saint-Denis, St. Gereon in Cologne, and the Abbey of Saint-Germain-des-Prés in Paris, are described as similarly ornate. Some small