| abstract
| - The Nihonshoki is often said to be the first mention of Hokkaidō in recorded history. According to the text, Abe no Hirafu led a large navy and army to northern areas from 658 to 660 and came into contact with the Mishihase and Emishi. One of the places Hirafu went to was called Watarishima, which is often believed to be present-day Hokkaidō. However, many theories exist in relation to the details of this event, including the location of Watarishima and the common belief that the Emishi in Watarishima were the ancestors of the present-day Ainu. During the Nara and Heian periods, people in Hokkaidō conducted trade with Dewa Province, an outpost of the Japanese central government. From the medieval ages, the people in Hokkaidō began to be called Ezo. Around the same time Hokkaidō came to be called Ezochi or Ezogashima. The Ezo mainly relied upon hunting and fishing and obtained rice and iron through trade with the Japanese. During the Muromachi period, the Japanese created a settlement at the south of the Oshima peninsula. As more people moved to the settlement to avoid battles, disputes arose between the Japanese and the Ainu. The disputes eventually developed into a battle. Takeda Nobuhiro killed the Ainu leader and established a Japanese victory. Nobuhiro's descendants became the rulers of the Matsumae Han, which ruled the south of Ezochi until the end of the Edo period. The Matsumae Han's economy relied upon trade with the Ainu. The Matsumae family was granted exclusive trading rights with the Ainu in the Azuchi-Momoyama and Edo periods. The Han gradually changed trade conditions so they came to favor Japanese merchants. As a result, some Ainu rebelled against the Matsumae han, but the rebellions were defeated. During the Meiji Restoration, the Tokugawa Shogunate realized there was a need to prepare northern defenses against Russian aggressions and took over most control of Ezochi. The Shogunate made the Ainu burden slightly easier, but did not change the overall form of rule. Hokkaidō was known as Ezochi until the Meiji Restoration. Shortly after the Boshin War in 1868, a group of Tokugawa loyalists led by Enomoto Takeaki proclaimed the island's independence as the Republic of Ezo, but the rebellion was crushed in May 1869. Ezochi was subsequently put under control of Hakodate-Fu (箱館府, Hakodate Prefectural Government). When establishing the Development Commission (開拓使), the Meiji Government decided to change the name of Ezochi. Matsuura Takeshirō submitted 6 ideas, including names such as Kaihokudo (海北道) and Hokkaidō (北加伊道) to the government. The government eventually decided to use the name Hokkaidō, but decided to write it as 北海道, as a compromise between 海北道 and because of the similarity with names such as Tōkaidō (東海道). According to Matsuura, the name was thought up because the Ainu called the region "Kai." Historically, many peoples who had interactions with the ancestors of the Ainu called them and their islands Kuyi, Kuye, Qoy, or some similar name, which may have some connection to the early modern form Kai. The Kai element also strongly resembles the Sino-Japanese reading of the characters 蝦夷 (Sino-Japanese /ka-i/, Japanese kun /emisi/), which have been used for over a thousand years in China and Japan as the standard orthographic form to be used when referring to Ainu and related peoples; it is possible that Matsuura's Kai was actually an alteration, influenced by the Sino-Japanese reading of 蝦夷 Ka-i, of the Nivkh exonym for the Ainu, namely Qoy. In 1882, the Development Commission was abolished, and Hokkaidō was separated into three prefectures, Hakodate (函館県), Sapporo (札幌県), and Nemuro (根室県). In 1886, the three prefectures were abolished, and Hokkaidō was put under the Hokkaidō Agency (北海道庁). Hokkaidō became equal with other prefectures in 1947, when the revised Local Autonomy Law became effective. The Japanese central government established the Hokkaido Development Agency (北海道開発庁) as an agency of the Prime Minister's Office in 1949 to maintain its executive power in Hokkaido. The Agency was absorbed by the Ministry of Land, Infrastructure and Transport in 2001. The Hokkaido Bureau of the Ministry still has a strong influence on public construction projects in Hokkaido.
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