Kannappa
In South Indian traditions, Kannappa is a devotee of the Hindu god Shiva. His story is closely connected with the Srikalahasteeswara Temple in Andhra Pradesh. He is a saint in the Saiva Siddhanta tradition.
Originally a hunter, Kannappa offered his devotion to a Siva Lingam by making simple offerings and eventually sacrificing one of his eyes. As he prepared to offer the second, Shiva appeared and stopped him.