The Therapeutae were a religious sect which existed in Alexandria and other parts of the ancient Greek world. The primary source concerning the Therapeutae is the De vita contemplativa ("The Contemplative Life"), traditionally ascribed to the Jewish philosopher Philo of Alexandria (c. 20 BCE – 50 CE). The author appears to have been personally acquainted with them. The author describes the Therapeutae as "philosophers" (cf. I.2) and mentions a group that lived on a low hill by the Lake Mareotis close to Alexandria in circumstances resembling lavrite life (cf. III.22). They were "the best" of a kind given to "perfect goodness" that "exists in many places in the inhabited world" (cf. III.21). The author was unsure of the origin of the name and derives the name Therapeutae/Therapeutides from