Boyd’s Bible Dictionary:
(venerable). Caius Julius Caesar Octavianus, grandnephew of, and heir to, Julius Caesar. Made first emperor of Rome B. C. 27, with title of Augustus. During his reign Christ was born (Luke 2:1). Died A. D. 14, aged 76 years.
Concise Bible Dictionary:
Title given to the Roman Emperors after Augustus Caesar, named in Luke 2:1. In Acts 25:21,25 the Augustus or Caesar at that time was Nero.
Strong’s Dictionary of Greek Words:
Transliteration:
sebastos
Meaning:
from 4573; venerable (august), i.e. (as noun) a title of the Roman Emperor, or (as adjective) imperial