(b Bologna or Volterra, 1512–15; d ?Rome, c. 1565).
Italian medallist and sculptor
. Son of the sculptor Zaccaria Zacchi (1473–1544) of Volterra, he spent almost his entire career in Bologna, working primarily for the Farnese family. One of his earliest and best-known medals (e.g. Florence, Bargello; see Pollard, p. 1292) was modelled in 1536 and shows the 82-year-old Venetian Doge Andrea Gritti. It is signed IO.
Other medals, signed either IO.