This King Manu is the 7th Manu of the present Kalpa. Also known as the Sraddadeva Manu. Being the son of Vivasvant / Vaivasvata he is also known as Vaivasvata Manu. He is supposed to be the first Human being on Earth. He is the first human ruler and the most honest one. Hence he is also called as Satyavrata. It is said that since all Men are from Manu, they are called Manavas. The ten sons of Manu are known as Vena, Dhrishnu, Narishyan, Nabhaga, Ikshvaku, Karusha, Saryati, the eighth, a daughter named Ila, Prishadhru the ninth, and Nabhagarishta. The Kingdom ruled by Manu in the current world parlance stretched from Madagascar & East Africa covering most of South Asia and Australia. The works by King Manu are Manava Grihyasutra, Manava Sulbasutra, and Manavadharmasashtra. The Manusmriti is the first book of Law.
Manu & the Matsyavataram
Once when King Manu was performing rituals on the banks of the river, a small fish came upto him and asked him to save it from a bigger fish. The King kept the fish in a jar and took care of it. The fish just kept growing bigger and bigger. King Manu realised that it was no ordinary fish. The fish spoke to him and imformed him about a huge flood that would cover the entire Earth. The King built a huge boat which housed the Saptarishis & family, 9 types of seeds & animals to repopulate the Earth
Kings of India 