Date clan

Date clan 伊達氏
The emblem (mon) of the Date clan
Home province	Mutsu
Parent house	Isa clan
Titles	Various
Founder	Isa Tomomune
Current head	Date Yasumune
Founding year	c. 1189
Dissolution	still extant
Ruled until	1871, Abolition of the han system
Cadet branches	Tamura clan (restored) Uwajima Yoshida

The Date clan (伊達氏, Date-shi^?) is a Japanese samurai kin group.

The Date family was founded in the early Kamakura period (1185-1333) by Isa Tomomune who originally came from the Isa district of Hitachi Province (now Ibaraki Prefecture), and was a descendant of Fujiwara no Uona (721-783) in the sixteenth generation. The family took its name from the Date district (now Fukushima Prefecture) of Mutsu Province which had been awarded in 1189 to Isa Tomomune by Minamoto no Yoritomo, the first Kamakura shogun, for his assistance in the Genpei War and in Minamoto no Yoritomo’s struggle for power with his brother, Minamoto no Yoshitsune.

During the Nanboku-cho Wars in the 1330s, the Date supported the Imperial Southern Court of Emperor Go-Daigo through Kitabatake Akiie, who had been appointed by the Emperor Chinjufu Shōgun or Commander in Chief of the Defense of the North.

As warlords gained and lost power in the Sengoku period, trying to unite the country, the Date, along with a handful of other powerful families, did all they could to retain independence and dominance over their section of the land (in the case of the Date, the far north). Though not gaining the fame or power of the likes of Oda Nobunaga, Uesugi Kenshin, or Toyotomi Hideyoshi, they resisted the invasions of these warlords into the north. Date Masamune (1566–1636) contributed in particular to this effort, consolidating the families of the north into alliances against the major warlords. In 1589, Masamune seized the Aizu Domain of the Ashina; and he installed himself at Kurokawa Castle in Wakamatsu province. However, the following year, Hideyoshi triumphed over the Hōjo of Odawara; and Hideyoshi then obliged Masamune to be content with the fief of Yonezawa (300,000 koku).