In the epic Mahabharata, Droņa (Sanskrit: द्रोण, Droņa) or Droņacharya or Guru Droņa was the royal preceptor to the Kauravas and Pandavas and incarnation of Brahma; an avatar of Brihaspati. He was the son of rishi Bharadwaja and a descendant of the sage Angirasa. He was a master of advanced military arts, including the divine weapons or Astras.