User blog comment:B214/Volume 21 info & spoilers/@comment-24.113.129.70-20160405050253/@comment-73.160.58.215-20160406153956

It's honestly hard to say. On the one hand we have Vali, who is only the great grandson of the "original" Lucifer (of course the House of Lucifer may have had numerous family heads preceding the infamous Satan who gave birth to Lizevim*, thus the first head of Lucifer may not be Lizevim's father). *NOTE: I prefer "Lizevim" over "Rizevim" because it better leads to his nickname "Lilin" that was mentioned. On the other we have the House of Gremory, which has had it stated clearly that there have been a number of unnamed family heads preceding Rias's father that have long since retired.

--ShadowDragon