assumed the title Prince of Monaco in 1612. This was first recognised internationally some two decades later by Spain, under whose protection the tiny state had found itself since 1524, but with the Treaty of Peronne (1641) Monaco planted itself firmly in the French orbit. Over the years, the Princes of Monaco acquired various titles, often through marriage to heiresses. More often than not, the titles brought with them actual estates, mostly in France.
Principe de Monaco Duc de Valentinois