What is "udyotakara"

Udyotakara (or Uddyotakara) (c. 6th century CE) was a philosopher of the Nyaya school of Indian philosophy. Subandhu’s mentioned him as the rescuer of the Nyaya. He was a brahmin of Bharadvaja gotra and he belonged to the Pashupata sect. His philosophical treatise, the was written to defend Vatsyayana's against the criticisms made by Dignaga.