Note 094
Diodorus Siculus attests and approves the hereditary succession of the priesthood among the Egyptians, the Chaldeans, and the Indians (1. i. [c. 73] p. 84, 1. ii. [c. 29 and 40] p. 142, 153, edit. Wesseling). The Magi are described by Ammianus as a very numerous family: "Per saecula multa ad praesens una eademque prosapia multitudo creata, Deorum cultibus dedicatur" (xxiii. 6). Ausonius celebrates the Stirps Druidarum (De Professorib. Burdigal. iv. [7]); but we may infer from the remark of Caesar (Bell. Gall. vi. 13), that in the Celtic hierarchy some room was left for choice and emulation.
Note to Chapter 20 of DECLINE & FALL by Gibbon