 For services to the Crown (rumored to be as a privateer), he initially received a land grant in Louisiana, near present-day St. Francisville.With that and other land parcels, he established three successful indigo plantations, which enabled him to amass great wealth.He named the main plantation in present-day Wilkinson County near Natchez, Mississippi, Northumberland Place in honor of supposed ties with the fabled British Percy lineage of Hotspur.