[15] By contrast, Tomba (1993) claims that the script is a development of c. 1930, with all supposedly older documents being deliberate forgeries.[2] The earliest stone inscription, found in the village of Khoibu, Manipur, is also believed to date to time of Ura Konthouba.[1] Another early copper plate Meitei inscription dates to the 8th century CE, inscribed during the reign of King Khongtekcha (c. 721 AD).[17][18][19] A stone inscription found[year needed] at Khoibu in Tengnoupal district, of current Manipur state, contains royal edicts of king Senbi Kiyamba (d. 1508), representing the earliest portion of the Chietharol Kumbaba or Royal Chronicle of Manipur.[20][better source needed] In 1980, a modernized version of the writing system was approved by Manipuri law for use in educational institutions.Meetei Mayek (Meitei script) was added to the Unicode Standard in October, 2009 with the release of version 5.2.