Which Douglas line are you researching? Dates and places help making connections.
I am not sure, My grandmother used to comment about the black douglasses. I know that they had to change their name to Drysdale as a result of the king of the time. I have name but not what actual lines.
My most recent Douglas ancestor is Mary "Polly" Douglas (b. abt. 1794 in Tennessee), daughter of Joseph & Margaret Douglas. Polly married William Fears in Grainger County, TN in 1809. Thanks for the greeting.