sentences:  He inherited his father's title of Constable of Castile, and was present at the signing of the Treaty of London (1604).Juan Fernández de Velasco was also Governor of the Duchy of Milan in the period 1592–1600 and 1610–1612.In 1595, he led the Spanish forces in the Battle of Fontaine-Française against the French, where he let victory slip through his fingers, due to excessive caution.