JOSEPHUS: ANTIQUITIES OF THE JEWS (tr. William Whiston)
BOOK XIX
CONTAINING THE INTERVAL OF THREE YEARS AND A HALF.
FROM THE DEPARTURE OUT OF BABYLON TO FADUS, THE ROMAN PROCURATOR.
CHAPTER 8.
WHAT OTHER ACTS WERE DONE BY AGRIPPA UNTIL HIS DEATH; AND AFTER WHAT MANNER HE DIED.

3. But before the multitude were made acquainted with Agrippa's being expired, Herod the king of Chalcis, and Helcias the master of his horse, and the king's friend, sent Aristo, one of the king's most faithful servants, and slew Silas, who had been their enemy, as if it had been done by the king's own command.