Board Thread:Lore Discussion/@comment-24.7.251.136-20141002032335/@comment-17114085-20141002182213

I think I know where he is getting the Six Eras thing from. He must be talking about the Dawn Era and the Merethic Era that came before the 1st Era.

As for the first Dragonborn that would be Miraak (As far as we know), who is from the Merethic Era/early first Era. I don't think an exact date was given to when he was a Dragon Priest but the Dragon Cult existed up until the early 1st Era before the Dragons were overthrown by the Nords.

For the rest of the information I have no idea what he is talking about...