Giovanni Battista Belluzzi

He was born in San Marino on September 27, 1506, and at 18 years of age was sent by his father to Bologna, to learn commerce under Bastiano di Ronco, a merchant of the Guild of Wool.

The couple lived with Girolamo Genga, from whom Giovanni learned architecture.

In 1543, Giovanni entered into the service of Cosimo I de' Medici, Grand Duke of Tuscany, as an engineer.

He designed fortifications for Florence, Pistoia, Pisa and San Miniato and also wrote a book on military architecture.

He was wounded in the siege of Montalcino and was killed by enemy fire in a fortress of Aiuola.