Francesco Sforza was born in San Miniato, Tuscany, one of the seven illegitimate sons of the condottiero Muzio Sforza and Lucia da Torsano. He spent his childhood in Tricarico (in the modern Basilicata), the marquisate of which he was granted in 1412 by King Ladislaus of Naples. In 1418, he married Polissena Ruffo, a Calabrese noblewoman.