"I had encouraged Phlegon to compose a series of chronicles"

The sixteen volumes of Phlegon's Olympiads, covering Graeco-Roman history from the 1st Olympiad (776 BC) to the 229th (137 AD) survive only as fragments in the work of later authors, notably Photius (http://www.tertullian.org/fathers/photius_03biblioteca.htm#97) and Eusebius (http://www.tertullian.org/fathers/index.htm#jeromechronicle).