Wow, going to test my knowledge of the early Pella days. I think you are right about Unforgiven being a splinter from The Banned, which I believe was splintered again into two alliances... I think Divine Blood being one.
I started with "The Banned" (there were two alliances actually, "The Banned" and "Banned Aid") Then there were a number of splits and to be honest I don't remember all the names anymore. There were 3-4 alliances after The Banned and then we all more or less came back together to form the original Mors Omnia Solvit core.
From the original group, not many that I have seen around. I don't know if most of them play anymore or not.
@Bend, Anonymous must have died fast, I don't remember them either. I remember fighting: White Eagles, Havoc, The Shadow League, Silver, 13th (aka the polish group), Nights Watch and a bunch of other smaller alliances in the early days.