In the Fountain of Life instance, at first., my group spent an hour clearing mobs without any named mobs spawning.
However, after examining the doors, we realized that we had been dropped into the zone inside the inner door. After opening the inner doors, we found we could interact with the stone inlays there in the inner room...foyer?. As soon as I clicked a slot for the eyes, even though we had none, the first named, Capt. A...(forgot his name) spawned. It was too immediate to be a coincidence, I think.
So, at least it appears that, although you don't need the Peacock quest series to gain access, you might need to click the stone slots in the floor in the foyer to get the first named mob to spawn.
I could be wrong, but after looking at four different websites trying to figure out why the named weren't spawning, I think I owe it to anyone else who might in the future bang their head on their computer trying to puzzle this out.
BTW, even at lvl74 with top gear, my wife and I, with 2 mercs, got killed by the first named, epic lvl65. Try to kill all the other mobs in the room first without pulling him , if you can.
Edited, Mar 21st 2015 11:23pm by Maccabee4