Satya Yuga

The Satya Yuga (Devanagari: सत्य युग), also called Sat Yuga, Krta Yuga and Krita Yuga in Hinduism, is the "Yuga (Age or Era) of Truth", when mankind is governed by gods, and every manifestation or work is close to the purest ideal and mankind will allow intrinsic goodness to rule supreme. It is sometimes referred to as the "Golden Age."
See more at Wikipedia.org...

Satya Yuga (Sanskrit) [from satya reality, truth + yuga age] The age of purity, reality, and truth, sometimes called the krita yuga, lasting 1,728,000 years. The first of the four great yugas constituting a mahayuga (great age). "The Krita is the age in which righteousness is eternal, when duties did not languish nor people decline. No efforts were made by men, the fruit of the earth was obtained by their mere wish. There was no malice, weeping, pride, or deceit; no contention, no hatred, cruelty, fear, affliction, jealousy, or envy. The castes alike in their function fulfilled their duties, were unceasingly devoted to one deity, and used one formula, one rule, and one rite. Though they had separate duties, they had but one Veda and practised one duty" (MB abrig Muir, 1:144).
What exist as the four great ages forming a great age, occur because of analogical repetitions. There is a greater age of immensely longer duration than even the mahayuga mentioned above: the same series of four immense periods -- of length respectively in the ratios of 4, 3, 2, 1 -- is likewise found in the manvantaric history of a globe as well as of a round. Every root-race has likewise its mahayuga; and it is evident that the satya yuga of the seventh root-race will be a far more advanced one than is the satya yuga of the fourth root-race, because in the former everything will be more evolved and on a higher plane. Consequently, there is not one single satya yuga, but many, both on lower and higher planes.