Board Thread:Lore Discussion/@comment-139.228.161.207-20150131164559/@comment-121511-20150131222350

The only difference between Aedra and Daedra is the role they played in the creation of Nirn. Aedra helped create it, either willingly or not, Daedra did not. Since Lorkhan was the architect of the entire endeavour, I would say that qualifies him as an Aedra.