By 1490, he seems to have come under the tutelage of Bertoldo di Giovanni
Other artists, such as Bertoldo di Giovanni
and Giovanni Francesco Rustici, experimented with terra invetriata, and Benedetto Buglioni, with his adopted son Santi, established a workshop that rivalled that of the Della Robbia and used the same technique.
The Four Seasons in Florence is famous for its 12 bas-reliefs by Bertoldo di Giovanni
, one of Michelangelo's teachers, dating from 1555.
It was a pet theory of Middeldorf's that the sculptor Bertoldo di Giovanni
was the illegitimate child of Giovanni de' Medici: he would certainly have been pleased with the discovery, announced in this volume (and published in full in the Institut's Mitteilungen in an article Boninger coauthored with Luca Boschetto), that Bertoldo was instead a German.
For Benedetto, like Pietro Torrigiano, the Florentine sculptor who broke Michelangelo's nose when they were both teenage apprentices of Bertoldo di Giovanni
, was that rarest of birds, an Italian artist who made his way to England in the early 16th century.