Gilby,
Many thanks for your corrections and added information. Perhaps this will answer some of the questions you had:
Burke's Dormand and Extinct Peerages
See FitzGerald--Baron FitzGerald and Vesey, p. 203.
"George of Hollymount, Co. Mayo married Frances, dau of
Archibald Stewart, Esq. of Ballintoy.
Taken from The Stewarts of Ballintoy by Hill
P. 25, Archibald Stewart was succeeded by his son, named also Archibald.
Of the latter not much is known beyond the facts that he was an influential
country gentleman and for a time enjoyed the distinction of being a member of parliament.
P.26, Archibald Stewart, Esq. in 1662, a member of the House, mentioned in a dispute with
Dr. Ralph King, also a member of the House.
P.37, mention made of Capt. James Stewart, Capt. Alexander Stewart, Alexander Stewart, Sr., Lt. Thomas Stewart, and Quartermaster Robert Stewart.