Plutarch, _De fortuna Romanorum_, 9. This statement would be strongly confirmed by etymology if we could be sure that, as Mr. A. B. Cook has suggested, the name Egeria is derived from a root _aeg_ meaning “oak.” The name is spelt _Aegeria_ by Valerius Maximus (i. 2. 1). See A. B. Cook, “Zeus, Jupiter, and the Oak,” _Classical Review_, xviii. (1904) p. 366; _id_. “The European Sky-God,” _Folk-lore_, xvi. (1905) pp. 283 _sq._; and as to the root _aeg_ see O. Schrader, _Reallexikon der indogermanischen Atertumskunde_ (Strasburg, 1901), p. 164. Footnote 545: Festus, _s.v._ “Querquetulanae,” pp. 260, 261, ed. C. O. Müller. Footnote 546: See below, p. 380. Footnote 547: Servius on Virgil, _Aen._ iii. 466. Footnote 548: Tacitus, _Annals_, ii. 54; Pliny, _Nat. Hist._ ii. 232; Pausanias, ix. 2. 11, x. 24. 7; Lucian, _Bis accusatus_, 1. Footnote 549: See above, vol. i. p. 18. Footnote 550: See above, pp. 130 _sqq._ Footnote 551: The first, I believe, to point out a parallelism in detail between Rome and Aricia was Mr. A. B. Cook (_Classical Review_, xvii. (1902) pp. 376 _sqq._); but from the similarity he inferred the humanity of the Arician priests rather than the divinity of the Roman kings. A fuller consideration of all the evidence has since led him, rightly as I conceive, to reverse the inference. See his articles “Zeus, Jupiter, and the Oak,” _The Classical Review_, xviii. (1904) pp. 360-375; “The European Sky-God,” _Folk-lore_, xvi. (1905) pp. 260-332. In the first and second editions of this work I had suggested that the _regifugium_ at Rome may have been a relic of a rule of succession to the throne like that which obtained at Nemi. The following discussion of the religious position of the old Latin kings owes much to Mr. Cook’s sagacity and learning, of which he freely imparted to me. Footnote 552: