Took me a few moments to find it, Orion, but here is the reference from Josephus.
http://www.ccel.org/j/josephus/works/autobiog.htm
http://www.ccel.org/j/josephus/works/autobiog.htm
Quote:2. Now, my father Matthias was not only eminent on account of is nobility, but had a higher commendation on account of his righteousness, and was in great reputation in Jerusalem, the greatest city we have. I was myself brought up with my brother, whose name was Matthias, for he was my own brother, by both father and mother; and I made mighty proficiency in the improvements of my learning, and appeared to have both a great memory and understanding. Moreover, when I was a child, and about fourteen years of age, I was commended by all for the love I had to learning; on which account the high priests and principal men of the city came then frequently to me together, in order to know my opinion about the accurate understanding of points of the law
