Juan Bautista de Toledo

Then, possibly, he continued his training in the construction site of St. Peter's Basilica, under the direction of Antonio da Sangallo the Younger.

However, in Naples and Madrid, he was identified as Juan Bautista de Toledo: both Spanish architects had the same hand writing.

[7] In the other sides of the first stone, the inscriptions are: in one side, "DEUS OPTIMUS MAXIMUS OPERO ASPICIAT"; and in the other side, "PHILIPUS HISPANIARUM REX A FUNDAMENTIS ERIXIR −1563": "En 23 dias del mes de abril, dia de San Jorge mártir, deste año de 1563 se puso la primera piedra del monasterio en el cimiento del reflectorio, debajo de la silla del prior, que es en la bodega, debajo del dicho reflectorio, la cual piedra es cuadrada y está escrita por todas partes, que da a entender quien es el fundador, y quien es el arquitecto y el día y año en que se pone".

[9] On 26 February 1947 “Michelangelo (…) informed the Florentine mason master Niccolo that he was to follow the orders of Giovanni Battista de Alfonsis, his personal choice as successor of Labacco(…)”.

In Naples, he designed and rebuilt many buildings, including: the Strada di Toledo (since 1870 called Strada di Roma), the church of St. Giacomo degli Spagnuoli; the square bastions to the Castel Nuovo; a large palazzo at Posillipo, Castel Sant'Elmo; and several fountains.

His yearly salary was at first no more than 220 ducats, because Philip's policy, with his Spanish artists at least, was to give them moderate allowances until he had tested their abilities.