This is a shot in the dark, but if you used an offsite tracker like Runetrack for any events far enough back and can still access those or a posted copy of results, that could give you an old clan list. And at least you could recognize those on that list? (After dealing with name changes.)
Otherwise, start with full clan list and use the March 2014 list from to eliminate those that were new after that and stare at the list for a while. No idea the size of Angels of Wrath, but this might get you a pretty good start.
12-Feb-2016 23:09:18