Some Answers
: 1a)Does anyone have any idea who Ceisoran was?
: All that we are told in the game is that he commisioned
: eleven ordinary copies of the Ibis Crown.
Yep that's all we get.
: 1b) Would it be a reasonable asumption that he was the
: unforunate last Emperor of the Cath Bruig? (Not
: counting Alric since he, to the best of our knowledge,
: is not of the Imperial line)
I think this is general opinion though someone will probably argue this.
: 2) Who is Baeldun? My best guess is that he is a close
: adviser to Alric, or one of his top generals. But is
: he anything special (read: is he an avatara?)
He could be an avatara but I think he is another general close to the rank of Cruniac. Someone speculated that he was a relative of Maeldun but this isn't backed up ingame. However, he is named alongside Alric and has control over the Seventh Legion so he could be an avatara.
: 3) Does anyone have information on where the Heron Guard
: would have been during the fall of Muirthemne, and why
: they were there instead defending their city and their
: Emperor?
It has been suggested that they were fighting at Bagrada though I can't find the evidence to suggest this.
: 4) When Twelve Motion Jeweled Skull mentioned fighting
: alongside Durak and Turgeis with Burning Steel, do we
: get the faintist clue anywhere on what Durak is? If
: so, what?
Zandervix has theorised that Durak is an avatara as his name does not fit any other unit. There is no conclusive evidence though.
: Information from any source (other then pure made up no
: logic behind it nonsense) is fine.
: P.S. Where besides the Ecyclopedia is such Myth lore
: found?
ThorulfR's site has some nice info on names but other than that there aren't any other lore sites around that provide the amount of info in L&L.