Somdet Phra Naresuan Maharat (Thai: สมเด็จพระนเรศวรมหาราช) was king of Ayutthaya from 1590 until his death in 1605 under the name Sanphet II.
Prince Naret was born in the city of Phitsanulok on the 25 April 1555. He was the son of King Maha Thammarachathirat of Phitsanulok and his queen Wisutkasat. His mother was a daughter of Maha Chakkrapat and Queen Sri Suriyothai. His father was a Sukhothai noble, who had defeated Vorawongsathirat in 1548 and put Maha Chakkrapat on the throne. Prince Naret was also known as the Black Prince (Thai: พระองค์ดำ)