Note 167 — BOOK XXVIII.
Charles Duke Yonge translation
This is an allusion to the story of Castor and Pollux bringing news of the victory gained at the battle of Regillus to Domitius (B.C. 496). The legend adds that they stroked his black beard, which immediately became red; from which he and his posterity derived the surname of Ænobarbus.—See Dion. Hal. vi. 13.