I am researching this family also. I have just finished doing a takeoff of the 1850 census for Cumberland Co. Va. I found Thomas Robiou 82 and his wife Elizabeth 70 on family #920 lines 40 and 41. It states he was born in France. If you do a search on Ancestry they haven't got him listed and can't find any of that surname. I took of all the Martins and the Trabues. I just have to figure out how they all fit together. I look forward to hearing from you.