In some Scottish and Irish tales deer are seen as "fairy cattle" and are herded and milked by a tutelary, benevolent, otherworldly woman (such as a bean sìdhe or in other cases the goddess Flidais), who can shapeshift into the form of a red or white deer [REF].
Cernunnos is a mythological figure in Continental Celtic mythology, and possibly one of the figures depicted on the Gundestrup cauldron.