: Well we don't know which leveler he fought, since we
: don't know when the first was around. So it could be
: the 1st, or the 2nd, or even the 7th for all we know.
(Long delay here, somehow I never got around to replying to this, but just started rereading recent posts and saw this again).
I've always numbered the Levellers by the numbered Era they ended. So, as Tireces was the Hero who ushered in the Third Era, the Leveller he defeated was the 2nd, by this numbering scheme; Moagim was the 3rd, and Balor the 4th.
Though it's unclear if the Trow's millennial troubles were Leveller-related, and if so, whether they took place early in the Four Eras or sometime before them. So there may well have been Levellers before the "1st" Leveler by human reckoning (i.e. the Leveller who ended the First Era).