The Codex Huygens is a Renaissance manuscript for a treatise on painting closely related to Leonardo da Vinci (1452–1519). Its author has been identified as the North Italian artist Carlo Urbino (ca. 1510/20–after 1585), who must have been familiar with Leonardo’s notes before they were dispersed. Some of the drawings are faithful copies of now lost originals by Leonardo. Others, like the Vitruvian Man, are related to Leonardo but independent interpretations in their own right. The extant manuscript, which appears to be only a fragment, includes five sections (books or regole).
— Leonardo da Vinci: Treasures from the Biblioteca Reale, Turin
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