 Turnbull was married to Maria Gracia Dura Bin, the daughter of a Greek merchant from Smyrna.His colony was located in the province of British East Florida, and encompassed some 101,400 acres (410 km²); it was nearly three times the size of the colony at Jamestown.In partnership with Sir William Duncan he secured a grant of 40,000 acres (160 km²) of land on the east coast of the peninsula, with the requirement from the British government that it be settled within 10 years in the proportion of one person for every .