sentences:  During the first period, between about 1450 and 1540, the Italian style was copied directly, often by Italian architects and craftsmen.In the second period, between 1540 and the end of the Valois dynasty in 1589, French architects and craftsmen gave the style a more distinctive and original French character.The major architects of the style included the royal architects Philibert Delorme, Pierre Lescot and Jean Bullant, and the Italian architect and architectural theorist Sebastiano Serlio.