This Gupta period polycephalic aspect of Vishnu (a "Saumya" benevolent face to the east, a "Simha" lion face to the south, a "Varaha" boar face to the north, a "Raudra" terrible human face to the west) is described in detail in the "Vishnudharmottara Purana" (compiled between the 4th and the 7th century CE) in conjunction with the description of the four "Vyūhas" Saṃkarṣaṇa, Vāsudeva, Pradyumna, and Aniruddha, also presented as emanations of Vishnu, as known from the Pancaratra doctrine.