Maha Thammarachathirat
Phra Maha Thammarachathirat (Thai: พระมหาธรรมราชาธิราช) or Somdet Phra Sanphet I (Thai: สมเด็จพระสรรเพ็ชญ์ที่ 1) or formerly known as Khun Phiren Thorathep (Thai: ขุนพิเรนทรเทพ) was the first King of Ayutthaya kingdom of the Sukhothai dynasty ruling from 1569 to 1590. As a powerful Sukhothai noble, Pirenthorathep gradually rose to power. After playing many political turns, he was eventually crowned as the King of Siam.
Read more about Maha Thammarachathirat: A Sukhothai Noble, King of Phitsanulok, King of Ayutthaya