I'd like to add that a lich would occassionally pop up in most graveywards but I haven't seen one at all in any GY here yet.
There is definitely a lich spawn at both Nujel'm and Jhelom graveyards on second age. Not sure if they changed things for this era but in T2A those lich bastards were alive(?) and kicking
By RunUO default Nujel'm graveyard is a guarded region, and this is why there is not an active spawn there at the moment. It's questionable whether or not the guard-lines for this region are correct, though I'm not entirely sure and will need to dig up some more information to find out what the original region settings were.
From my only other experience with uo (second age) there is a regular GY spawn there very similar to the one in Jhelo'm. I will just stick to that one for now, it would just be nice to have another decent low level spawn for raising fighting skills close to town.