Ise Sozui

...The founder of the Hojo clan was Ise Sozui (commonly known as Hojo Soun), and for five generations, Ujitsuna, Ujiyasu, Ujimasa, and Ujinao, were feudal lords who flourished in the Kanto region, with Odawara Castle in Sagami as their base (illustration). Soun's origins and many other details are shrouded in mystery, but he appeared on the historical stage in 1476 (8th year of Bunmei) as a mediator in the internal conflict within the Imagawa clan after the death of Yoshitada.

*Some of the terminology that mentions "Ise Morizui" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…伊勢宗瑞(俗称北条早雲)を始祖とし，氏綱，氏康，氏政，氏直と5代にわたり相模の小田原城を本拠として関東に雄飛した戦国大名（図）。早雲はその出自など多くがなぞにつつまれた人物であるが，1476年(文明8)に義忠没後の今川家内紛の調停役として歴史の舞台に登場した。…

※「伊勢宗瑞」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報