Cassandra certainly existed; she is in the Belfast News Letter of the 1790s. I am not related in any way to Montgomerys but I have researched a few of the families to whom they connect, for my work on the Dictionary of Irish Biography. In that context I am interested in the Killead Montgomerys because I worked on the Carlisles who were ship designers and shipowners in Belfast; their mother was a Montgomery. They really are or were related to everyone; we would need a computer genealogy program that can do 3D modelling. Linde