With the Tuscan order, a simplified version of the Doric order, also found in ancient Roman architecture but not included by Vitruvius in his three orders, the Composite was added by Renaissance writers to make five classical orders. Sebastiano Serlio (1475–1554) published his book "I Sette libri dell'architettura" in 1537 in which he was the second to mention the Composite order as its own order and not just as an evolution of the Corinthian order as previously suggested by Leon Battista Alberti. Leon Battista Alberti in his "De re aedificatoria" (English: "On the Art of Building") mentions the Composite order, calling it "Italic".