In the absence of authentic information one may do no more than suggest that, when the lad was newly in his teens, he served in the studio of some local painter and discovered his own talent. Attempts have been made to give the teacher a name and a history, but these efforts, for all that they are interesting, lack authenticity. Far away in Florence the first faint light of the Revival of Learning was shining upon the more intelligent partisans of all the jarring factions. The claims of the religious life were being put forward with extraordinary fervour and ability by a great teacher and preacher, John the Dominican, who appears to have reformed the somewhat lax rules of his order. We are told that he travelled on foot from town to town after the fashion of his time, calling upon sinners to repent, and summoning to join the brotherhood all those who regarded life as a dangerous and uncertain road to a greater and nobler future. Clerics looked askance at the signs of the times, for although art and literature were coming into favour, although Florence was becoming the centre of a great humanist movement, the change was associated with a recrudescence of pagan luxury and vices that boded ill for the maintenance of moral law. Perhaps John the Dominican preached in Vicchio, perhaps Guido and his younger brother Benedetto heard him elsewhere, but wherever the message was delivered it went home, for it is recorded that in the year 1407, when Fra Angelico would have been just twenty years old, he and Benedetto travelled to the Dominican Convent on the hillside at Fiesole and applied for admission to the order. The brothers were welcomed and sent to serve their novitiate at Cortona, where some of Fra Angelico's earliest known work was painted. They returned to Fiesole in the following year, but the Dominican establishment there was soon broken up because the Florentines had acknowledged Alexander V. as Pope, and the Dominican Brotherhood supported his opponent, Gregory XI. Foligno and Cortona were visited in turn. In the former city the Church of the Dominicans remains to-day; and so the brethren sought peace beyond Fiesole, until in 1418 the Council of Constance healed the wounds of Mother Church. Then Pope Martin V. came to live in Florence, where John XXIII. paid him obeisance, and the Dominican friars returned to their hillside home beyond the city, that was then, according to the historian Bisticci, "in a most blissful state, abounding in excellent men in every faculty, and full of admirable citizens."