He was in King and Queen County, Virginia by 1660 when he was granted 2,314 acres on the south side of the Mattapony river in the parish of Saint John's, in the county of New Kent. The patent for the land was lost in the troubles during Bacon's rebellion. (This is the land on which Indian Town was located near Sandy Point.)
Roger Mallory obtained a grant of land in Virginia in 1660. He soon settled, gathered land, and reared a family on the Mattapony River. His uncle, the Rev. Philip Mallory (had no heirs), also willed to him all his plantations in Virginia, which made Roger one of the wealthiest men in the Colony. He settled in that part of New Kent County, Virginia, which later became King and Queen County and still later King William County.
Roger was Justice of the Peace of New Kent County (1680-1690), of King and Queen Co. (1693), and of King William County (1704). During the years 1688-1700, he acquired 4,814 acres of land in addition to his vast holding inherited from his father and his uncle Philip. From 1676 to 1693 he was referred to as Captain Roger Mallory, Gentleman. He was also a Captain in the colonial militia.
On 22 December 1695, the Chickahominy Indians conveyed 6,160 acres on Pamunkey Neck to Roger Mallory. He must have died soon afterwards for in 1697 John Buckner applied for a patent to this land he having purchased right from Roger, Charles, and Thomas Mallory, sons of the decedent. The Land Office issued a 3,080-acre patent to Buckner in 1702. The General Assembly evaluated settlements on Pamunkey Neck and in 1699 having taken into consideration settlement of land on Pamunkey Neck gave preference to the above three sons of Roger Mallory, bounded as by deed and computed at 2,000 acres because the said Mallory had been given other lands in exchange.