Circe

art by Madeline Miller
from Homer's 'The Odyssey':

...At that, they shouted, and called to her, and Circe came to open the shining doors, and invite them to enter: and so they innocently followed her inside. Eurylochus alone, suspecting it was a trap, stayed behind. ... When they had drunk the brew she gave them, she touched them with her wand, and herded them into the pigsties. Now they had the shape and bristly hide, the features and voice of pigs, but their minds were unaltered from before.

There they wept in their pens, and Circe gave them acorns, beech mast, and cornel fruit to eat, such as pigs feed on as they churn the mud..."