The stone inscription at Wat Phra That Sri Don Kham explicitly records that the temple (or its major structures) was established or underwent significant restoration in 1626 A.D. (2169 B.E.). This period aligns with the reign of King Prasat Thong of Ayutthaya or the era when Lanna was under Burmese influence. The inscription serves as vital archaeological evidence, allowing historians to pinpoint the flourishing period of Long City and confirming the temple’s status as a religious hub for over 400 years. It is inscribed in the traditional Lanna Dhamma script, representing the region's unique cultural identity.