Nigantha Nātaputta (Nāthaputta)
One of six eminent teachers, contemporary with the Buddha; he is described as a heretic (aññatitthiya, E.g., S.i.66).
He was leader of a sect known as the Niganthā, and a summary of his teachings is found in the Sāmaññaphala Sutta (D.i.57; DA.i.166).
A Nigantha is restrained with a fourfold restraint (cātuyāma samvara)