Morons. Those are his birth and death dates. He came to power in 54, if I remember correctly.
(31 or) 27 B.C. - 14 A.D.Augustus
14 - 37 Tiberius
37 - 41 Caligula
41 - 54 Claudius
54 - 68 Nero
Year of the 4 Emperors
68 - 69 Galba