Suetonius,
The Lives of the Twelve Caesars…
“ XVII. VERRIUS FLACCUS [887] , a freedman, distinguished himself by a new mode of teaching; for it was his practice to exercise the wits of his scholars, by encouraging emulation among them; not only proposing the subjects on which they were to write, but offering rewards for those who were successful in the contest. These consisted of some ancient, handsome, or rare book. Being, in consequence, selected by Augustus, as preceptor to his grandsons, he transferred his entire school to the Palatium, but with the understanding that he should admit no fresh scholars. ”
