The most approved classical preservatives against lightning were the eagle, the sea-calf, and the laurel. Jupiter chose the first, Augustus Caesar the second, and Tiberius the third.
(Columella, x.; Sueton, in Vit. Aug., xc.; ditto in Vit. Tib., lxix.) (See House-Leek.) Bodies scathed and persons struck dead by lightning were said to be incorruptible; and anyone so distinguished was held by the ancients in great honour. (J. C. Bullenger: De Terrae Motu, etc., v. 11.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894