Guidobaldo del Monte's father, Ranieri, was from a leading wealthy family in Urbino. Ranieri was noted for his role as a soldier and also as the author of two books on military architecture.
Guidobaldo del Monte 's ama, Ranieri, ay mula sa isang nangungunang yumaman pamilya sa Urbino. Ranieri ay kilala para sa kanyang papel bilang isang kawal at din bilang ng mga may-akda ng dalawang mga libro sa militar architecture.