Vitruvius, De Architectura 7.6–8. See also Parsons, Alexandrian Library, p. 150; and El-Abbadi, Life and Fate, pp. 105, 111. Vitruvius lived during the same period as Julius Caesar, Philo Judaeus and Jesus Christ. He was a famous Roman architect, engineer and city planner. The work cited here is a handbook for Roman architects. His style for architecture and city planning was largely Greek, as he lived at the beginning of the phase of creative Roman architectural style, and his work heavily influenced Renaissance art, architecture and engineering. Pliny the Elder borrowed heavily from Vitruvius in the preparation of his Natural History. As was typical in the ancient world, Pliny does not cite his sources and credit Vitruvius. De Architectura contains ten books on building materials, Greek designs in temple construction, private buildings, floors and stucco decoration, hydraulics, clocks, measurement skills, astronomy, and civil and military engines. He was classically Hellenistic in his perspective.