I have not done any further work on the Stuart line in years. I have paperwork from Nova Scotia that puts Alexander Stuart there before coming to Maine were he comes from before that or maybe Nova Scotia I don't know.Is Your Lydia's last name Phantom? I have a deed dated 1808 Book 5 pg 423 Plantation #22 Washington Co Maine Alexander Stuart (Schoolmaster)wife Hannah mentions his son Alexander( who is married to Lydia Lockwood). Lydia Lockwood was born in Gouldsboro Maine 28 Feb.1788 GTR. She is the daughter of Samuel Lockwood ( I have never found any info on him) and Hannah Young Lockwood who later marries Alexander McCaleb.
Lydia appears to have had a sister Liddy who died young. I believe I might have something else that states Alexander Stuart was in Nova Scotia before Machiasport hopefully with a date but I'll have to look tomorrow.