Thanks. I've got most of that information but then there's more conflicting information.
I have this:
A handwritten note by Charles G Stuart, JP, Ballyhivistock where he traces his family back to Robert Stuart, a relative of James I, who obtained lands in County Cavan at the Plantation. His grandson William raised his own regiment "Stuart's Regiment" at his own expense to fight for William III. The king never refunded him. Rev. Irwin Stuart is the grandson of said William Stuart.
But then there's another William Stuart. General William Stewart 1643-1726, second son of Colonel William Stewart.
https://en.m.wikipedia.org/wiki/William_Steuart_(British_Army_officer)
I don't like using Wikipedia much.
I have an error in my tree surrounding Irwin Stuart's father and grandfathers. Some say that Irwin's father was James and others say he was Henry. I have it down as such (and you'll notice the error by the birth years):
Irwin Stuart (1708-1771 m. Elizabeth McDaniel) son of
Henry Stuart (b. Abt. 1680..m. Jane Irwin) son of
William Stuart (m. Mary Moore) son of
James Steuart (1650-1689) brother of the above mentioned William Stuart, son of
William Stuart (1625-1691 m. Barbara Stewart) son of
William Stewart of Mains, son of
Alexander Stewart, 6th Laird of Garlies (m. Christian Douglas)
It goes on further but I think you get the idea. So somewhere between Henry Stuart and William Stuart of Mains there are errors.