When, in December 1391, at the end of a novitiate lasting a year, the painter Piero di Giovanni made his profession in the Camaldolese monastery of Santa Maria degli Angeli in Florence, assuming the name of Don Lorenzo,[1] he must already have been a well-known and esteemed artist in the city and hence no longer very young. Presumed in the older literature to have been born in Siena,[2] he seems to have been trained as an artist in Florence, serving in the bottega of Agnolo Gaddi , with whom he later collaborated in the painting of the predella of the altarpiece in the Nobili Chapel in Santa Maria degli Angeli, formerly dated 1387.[3] Ordained a deacon in 1394, he dedicated himself in the following years to the painting of miniatures, particularly the illumination of the choir-books of his monastery and of other monastic communities (choir-books nos.
Having overcome his first creative phase, essentially derived from the model of Agnolo