Peter Deunov /ˈdʌnɒv/ (Bulgarian: Петър Дънов, IPA: ['pɛtər 'dɤnоf]; July 11, 1864 – December 27, 1944), also known by his spiritual name Beinsa Douno (Bulgarian: Беинса Дуно, [bɛinˈsа duˈnɔ]), and often called the Master by his followers, was a Bulgarian philosopher and spiritual teacher who developed a form of Esoteric Christianity.