Phra Rattanapanya Thera, also known as Phra Sirirattanapanya Thera, was a high-ranking Buddhist monk of the rank of sangharaja (ecclesiastical governor) during the reign of King Mueang Kaeo, also known as King Tilokpanatdharat of the Lan Na Kingdom.
The birthplace of Phra Rattanapanya Thera remains uncertain. Some sources state that he was born in Chiang Rai or Lampang [1] , while others suggest Phayao [2] . He is thought to have been born around 2016 BE (1473 CE). Phra Rattanapanya was ordained and resided at Wat Pa Kaeo in Chiang Rai before continuing his studies in Chiang Mai, where he stayed at Wat Silaram (present-day Wat Chet Yot). He later resided at Wat Fon Soi, where he became abbot, and subsequently moved to serve as abbot of Wat Chet Yot during the reign of King Mueang Kaeo, when the temple was recognized as a royal monastery. [3]
In 2060 BE (1517 CE), during the 23rd rains retreat of his monastic life—when he was likely about 44 years old—Phra Rattanapanya composed the Jinakalamali during the reign of King Tilokpanatdharat. Evidence within the text indicates his deep knowledge of the Tipitaka, the Atthakatha (commentaries), and exceptional skill in the Pali language. [4]