Eidaka

Japanese: 永高 - えいだか

Also called Eizo and Eibetsu, this refers to the amount of tax collected expressed in the value of the Yongle coin. Taxes were widely paid in cash from the end of the Kamakura period, but in the Muromachi period, imported Yongle coins from the Ming Dynasty began to circulate as high-quality copper coins, and Yongle coins became the standard for expressing tax payments. The Kanko system, which was favored by feudal lords in the Sengoku period, also expressed the amount of tax collected in Eizo. For example, the value of the Yongle coin was set at twice that of the Sei coin, and all transfers of land to fiefs were based on this system. Eizo was especially prevalent in the Kanto region, and was the precursor to the Kokudaka system that was established after the Taiko survey of land, but it disappeared after the use of the Yongle coin was banned in 1608. However, it was used in some places in conjunction with the Bitan coin as a unit of monetary calculation, and in particular, 1 Ei kanmon was used to express the amount of tax collected in cash for Tenryo, with 4 Bitan kanmon being used instead of 1 Bitan kanmon. The names also remain such as Kuchinaga, Kawanaga, and Yamanaga.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

永盛，永別ともいい，永楽銭の価額で表示された年貢収納高。年貢の銭納は鎌倉時代末期から広く行われたが，室町時代になって輸入された明の永楽銭が良質の銅貨として流通したので，銭納の表示に永楽銭が基準とされた。戦国大名が好んで取入れた貫高制も，永高による年貢の収納高を表示したもので，たとえば関東の後北条氏 (→北条氏 ) は永楽銭の価値を精銭の2倍として，知行宛行などすべてこれによった。永高は特に関東で行われ，太閤検地以後の石高制の前段階をなすが，慶長 13 (1608) 年の永楽銭通用禁止以後消滅していった。しかし一部には貨幣計算の単位として鐚銭 (びたせん) と対比して併用され，特に天領の銭納年貢の表示には永1貫文を鐚4貫文とした。また口永，川永，山永のような名称として残った。

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