Prince Naret was born in the city of Phitsanulok on 25 April 1555. He was the son of King Mahathammarachathirat of Phitsanulok and his queen consort, Wisutkasat. His mother was a daughter of Maha Chakkraphat and queen consort Suriyothai. Prince Naret, also known as the "Black Prince" (Thai: พระองค์ดำ), had a younger brother Ekathotsarot, known as the "White Prince", and an elder sister, Suphankanlaya.