See if you can find any authentic old legends of Taliesin online.

Try this: The Birth of Taliesin, which tells of how Taliesin was conceived in an episode of shape-shifting in which he (as Gwion) ended up in the belly of the witch Ceridwen after she (in the form of a hen) gobbled him up in the form of a grain of wheat.

Didn't Disney cover this sort of thing in one of their cartoons?