The occasion of this festival is uncertain. Some have considered it the festival in honor of the birth of Claudius; others, a festival in honor of the return of Claudius from Britain. But neither of these suggestions is likely. It is more probable that the festival mentioned was the Quinquennalia, instituted by Herod the Great in honor of Augustus in 12 b.c. (see Josephus, Ant. XV. 8. 1; B. J. I. 21. 8), and celebrated regularly every five years. See Wieseler’s Chronologie des ap. Zeitalters, p. 131 sqq., where this question is carefully discussed in connection with the date of Agrippa’s death which is fixed by Wieseler as Aug. 6, 44 a.d.