Here is a tale from the Mabinogion

       sung to me by the bard Aneurin
       of Neil who could recast his shape.

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       Just as a man on a hot day casts off
       his cloak, so Neil could shift his shape;
       this was a gift from the other world.

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       In the Comrades Land he looked like
       a fire-breathing dragon,
       but he became a sheep in Saxon realms.

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       When the Iron Lady of the Angles
       was attacked by the Westlanders
       he became a bag of wind and saved her.

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       He could even make himself invisible.
       The men of the Hollow Hills did not see
       him at all during a year and day at war.

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       He changed from Briton to Roman
       and they called him great in their
       Councils and Capitals.

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       He had command of the nature of all animals,
       he spent much time in the form of an old goat,
       but his favourite shape was that of a fat cat.

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       His finest trick was to turn himself
       inside out and people thought it was scarlet
       ermine and they called him a true Lord.

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       He even passed his powers on
       to a second generation and the son
       is like the father in every way.

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       One day Neil was trapped by a Mirror
       and there he saw he had no skin left
       and his skull was a gleaming Jewel.