534 (Ankan 1, 12th month): The Yamato court sends a military force to appoint Omi as the governor of Musashi Province, his rival, Wogi was executed by the court. Omi presented four districts of Musashi Province to the court as royal estates.[6]
July 18, 707 (Keiun 4, 15th day of the 6th month):Empress Genmei is enthroned at the age of 48.[7]
707 (Keiun 4): Copper was reported to have been found in Musashi province in the region which includes modern day Tokyo.[8]
708 (Keiun 5): The era name was about to be changed to mark the accession of Empress Genmei; but the choice ofWadō as the newnengō for this new reign became a way to mark the welcome discovery of copper in theChichibu District of what is nowSaitama Prefecture.[8] The Japanese word for copper isdō (銅); and since this was indigenous copper, the"wa" (the ancient Chinese term for Japan) could be combined with the"dō" (copper) to create a new composite term—"wadō"—meaning "Japanese copper".
May 5, 708 (Wadō 1, 11th day of the 4th month): A sample of the newly discovered Musashi copper was presented in Genmei's Court where it was formally acknowledged asJapanese copper.[8] The Wadō era is famous for the first Japanese coin(和同開珎;wadokaiho orwadokaichin).
Higashitama District (東多摩郡,Higashi-Tama-gun, "East Tama District") – part of Tokyo since its creation, merged with Minamitoshima District to becomeToyotama District (豊多摩郡) on April 1, 1896, in turn merged into Tokyo City in 1932
Kitatama District (北多摩郡,Kita-Tama-gun, "North Tama District") – was part of Kanagawa in 1878 until being transferred to Tokyo in 1893; North Tama's lasttowns became [by definition: district-independent]cities in 1970
Minamitama District (南多摩郡,Minami-Tama-gun, "South Tama District") – was part of Kanagawa in 1878 until being transferred to Tokyo in 1893; South Tama's last towns were turned into cities in 1971
Nishitama District (西多摩郡,Nishi-Tama-gun, "West Tama District") – was part of Kanagawa in 1878 until being transferred to Tokyo in 1893
