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In page Anawrahta:

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Scholarship believed until recently that Anawrahta commissioned the invention of the Burmese script based on the Mon script, c. 1058, a year after the Thaton conquest.[1] However, recent research finds that the Burmese script had been in use at least since 1035, and if an 18th-century recast inscription is permissible as evidence, since 984 CE.[2]