Between 30-20 BC, Vitruvius publishes "De Architectura", a book that serves as a foundation for architecture, engineering, and town planning. Vitruvius also elaborates on proportionality in the human body and relates it to the construction of a pleasing temple structure. In these passages, Vitruvius's descriptions of human proportions would inspire Leonardo da Vinci to draw his "Vitruvian Man". 

Source: Isaacson, Walter. “Vitruvian Man”. Leonardo Da Vinci. Simon & Schuster, 2017.

Photo Source: https://commons.wikimedia.org/wiki/File:De_architectura_libri_dece_Wellc...