What is "prithu"

According to Hindu mythology, Prithu ( Sanskrit: पृथु, Pṛthu, lit. "large, great, important, abundant") is a sovereign ( chakravartin), named in the Vedic scriptures and considered an Avatar (incarnation) of the preserver god— Vishnu. He is also called Pruthu, Prithi and Prithu Vainya, literally, Prithu — the son of Vena. Prithu is "celebrated as the first consecrated king, from whom the earth received her ( Sanskrit) name Prithvi." He is mainly associated with the legend of his chasing the earth goddess, Prithvi, who fled in the form of a cow and eventually agreed to yield her milk as the world's grain and vegetation. The epic Mahabharata and text Vishnu Purana describes him as a part Avatar (incarnation) of Vishnu.