"He devised a novel and unheard of kind of pageant; for he bridged the gap between Baiae and the mole at Puteoli, a distance of about thirty-six hundred paces, by bringing together merchant ships from all sides and anchoring them in a double line, afterwards a mound of earth was heaped upon them and fashioned in the manner of the Appian Way. Over this bridge he rode back and forth for two successive days... know that many have supposed that Gaius devised this kind of bridge in rivalry of Xerxes, who excited no little admiration by bridging the much narrower Hellespont; others, that it was to inspire fear in Germany and Britain, on which he had gardens, by the fame of some stupendous work. But when I was a boy, I used to hear my grandfather say that the reason for the work, as revealed by the emperor's confidential courtiers, was that Thrasyllus the astrologer had declared to Tiberius, when he was worried about his successor and inclined towards his natural grandson, that Gaius had no more chance of becoming emperor than of riding about over the gulf of Baiae with horses."