Roddam Hulke Douglas was born on 19 Jul 1817 at Fareham, Hampshire, England. His parents were Admiral Peter John Douglas RN and Lydia Moriarty. Roddam was educated at the English College, Caen, France. He arrived in Hobart, Van Diemen's Land, on 25 Apr 1832 with his aunt Ellen Moriarty on the barque Persian. A pioneer of the Dunorlan district near Deloraine, he gained experience on his uncle Captain Moriarty's property. He returned to England and on 3 Dec 1839 at Hatton, Middlesex, married Mary Selina Langslow, a daughter of Captain Richard Langslow. Roddam and Mary sailed to VDL in 1840 and had 13 children between Nov 1840 and Feb 1864. Their seven youngest children were christened at the Methodist Church at Westbury.
Roddam was a member of the Westbury Council and was appointed as a Justice of the Peace in 1857. He ran a coach service from Westbury, and later Deloraine, to the Plough Inn, Charles Street, Launceston and return. He also spent fourteen years in the Evandale district.
His wife Mary died on 22 Sep 1895 at 218 Charles Street, Launceston, and was interred in the Westbury Church of England burial ground. Roddam Hulke Douglas died on 2 Jul 1902 in his 85th year at the residence of his son Onslow Gordon Douglas, 69 Elphin Road, Launceston.