The Vishnu Purana has a theory about Vyasa. The Hindu view of the universe is that of a cyclic phenomenon that comes into existence and dissolves repeatedly. Each cycle is presided over by a number of Manus, one for each Manvantara, that has four ages, Yugas of declining virtues. The Dvapara Yuga is the third Yuga. The Vishnu Purana (Book 3, Ch 3) says: