User blog comment:Hereticalthoughts/Why Solaire is not, never was, and never will be the Firstborn/@comment-69.200.240.11-20160405222759

Well DARK SOULS 3 SPOILERS,

Here is a theory. The boss in dark souls 3 "The nameless King" weilds the same spear as the statues in DS1 + 2 and also uses sunlight blade, a miracle used by the "firstborn of gwyn" and describled as nameless himself. I think it is confirmed that this nameless king is the first born and unfortunately, not our delightful buddy solaire.