of Castro was a fiefdom in central Italy formed in 1537 from a small strip of land on what is now Lazio's border with Tuscany, centred on Castro, a fortified
200,000 écus to spend on land in France, and the ducatodiCastro (duchy of Castro). After Castro's death, Diane would go on to marry Montmorency's eldest
Suprema Giunta degli Abusi. s.l. 1772. Diritto del re delle Sicilie sul DucatodiCastro e Ronciglione. Naples. 1773. Copeland 2003, pp. 754–755 Jade Koekoe