Three great tertöns are Nyi ma 'od zer, chos kyi dbang phyug, and Rig 'dzin rgod ldem 'phru can. Nyang ral Nyi ma 'od zer (12th century) and Guru Chos kyi dbang phyug (13th century) are known as the Sun and Moon. gTer ma they discovered are called Upper and Lower treasures, or gter kha gong 'og. Rig 'dzin rgod ldem 'phru can (14th century) was editor and compiler of gter known as the Northern Treasures