What's the story of IOTA?

Who started it? Who thought of the using a DAG PoW?
Was it iotatoken (David) who commissioned/paid for the Tangle whitepaper?
When did CfB come on-board? What are the nature of these relationships and how did it all come together?

Id like to know the true genesis of IOTA, if somebody could lay it out please.

thanks.