Kātyāyana or Mahākātyāyana was a disciple of Gautama Buddha. He is listed as one of the ten principal disciples and was foremost in expanding on and explaining brief statements of the Buddha.
In Thai Buddhism, he is also known as Phra Sangkajai... Wikipedia
Born: Ujjain, India
Full name: Nalaka
Books: The Peṭakopadesa
Parents: Chandima Brahmin and Tirīțavachcha Brahmin
Teacher: Gautama Buddha