While I could easily spoil you, I strongly suggest that you replay the game and find out for yourself..it is a very interesting story and involves a great deal of roleplaying, conversation and mystery. Please try and find out for yourself, it is so much more fun...
I'll just give you a hint: his life is tangled with that of the Nameless One.
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Melusine, High Queen of Fluffies, Archbabe of the Order of the Holy Flame and the Laughing Hyenas, &
Official Entertainer Elf of the BG2 Bar
Your voice is ambrosia