Multi-verse Theory and a Fine-Tuned Universe question...?

Which came first? The discovery of our Finely Tuned Universe or the Multiple Universe Theory? Fine-tuned Universe: The fine-tuned Universe is the proposition that the conditions that allow life in the Universe can only occur when certain universal fundamental physical constants lie within a very narrow... show more Which came first? The discovery of our Finely Tuned Universe or the Multiple Universe Theory?

Fine-tuned Universe:
The fine-tuned Universe is the proposition that the conditions that allow life in the Universe can only occur when certain universal fundamental physical constants lie within a very narrow range, so that if any of several fundamental constants were only slightly different, the Universe would be unlikely to be conducive to the establishment and development of matter, astronomical structures, elemental diversity, or life as it is presently understood.

Multiverse:
The Multiverse hypothesis assumes the existence of many universes with different physical constants, some of which are hospitable to intelligent life. Because we are intelligent beings, we are by definition in a hospitable one.

In other words...
Was the Multi-verse concept already established as a published theory when the discoveries of how finely tuned our universe actually is became known? Or was the Multi-verse theory simply a convenient way of explaining away the astronomical odds (pun intended) against a finely tuned universe apart from an intelligent creator?
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