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Books about Mangrai:
The Shan States and the British annexation / by Sao Saimong Mangrai (1965)
The Laws of King Mangrai (Mangrayathammasart): The Wat Chang Kham, Nan Manuscript from the Richard Davis Collection... by Aroonrut Wichienkeeo and Gehan Wijeyewardene (1986)
Wiki information Mangrai:
King Mangrai, also known as Mengrai, was the 25th King of Ngoen Yang and the first King of Chiang Mai, capital of the Lanna Kingdom.
Wat Phaya Mangrai is a ruined temple located within the Wiang Kum Kam archaeological site, very close to the south-eastern side of Wat Oong Dam. It is named after the historic figure Mangrai the Great.