The Glade 4.0

Did they ever detail the history of Frostmourne? Was it some how originally connected to Ner'zhul? I know Ner'zhul was imprisoned by the burning legion, Kil'jadien (sp) especially and manifested himself as a set of armor. But Was Frostmourne just a regular evil artifact? Or was it all part of a plot?

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"Life isn't divided into genres. It's a horrifying, romantic, tragic, comical, science-fiction cowboy detective novel. You know, with a bit of pornography if you're lucky."
— Alan Moore

More than they'd like, it's been retconned at least once.
http://www.wowwiki.com/Frostmourne

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Well Ali Baba had them forty thieves, Scheherezade had a thousand tales
But master you in luck 'cause up your sleeves you got a brand of magic never fails...
...Mister Aladdin, sir, What will your pleasure be?
Let me take your order, Jot it down -You ain't never had a friend like me
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