A bit of info behind my username - Palden Lhamo is a wrathful deity in Tibetan buddhism who is a protecting dharmapala, and also serves as the main protectress of Tibet, and to a slightly lesser extent, the Dalai and Panchen Lamas, and Lhasa.
She is usually depicted in nakthang [black-ground style scroll] crossing the sea of blood riding side-saddle on a white mule. There is an eye on the left rump of the mule which is the place where her irate husband’s arrow found a mark. She had killed her son and used his flayed skin as a saddle blanket. [source]
She was married to a king who was a tyrant; initially she tried dissuading him from violence and to turn to Buddhism - but their son was being raised to “finally put an end to Buddhism” so he ended up being used for leather goods.