Lifespan: Eishō 14 (1517) to 11/9 of Keichō 4 (1599)
Lord: Oda Nobuyasu
Father: Horio Yasumasa
Children: Yoshiharu, Jirō-no-suke, Ujimitsu
Horio Yasutane served as a bushō during the Sengoku and Azuchi-Momoyama periods.
Yasutane was the son of Horio Yasumasa and father of Horio Yoshiharu. Yoshiharu held the position of a sanchūrō, one of three senior retainers of the Toyotomi family who served as intermediaries to resolve differences between two other high-ranking groups in the Toyotomi administration – the gotairō and the gobugyō formed toward the end of Toyotomi Hideyoshi’s life to administer political affairs through a council system until his son and designated heir, Toyotomi Hideyori, became an adult capable of leading the administration.
The Horio clan was a dogō, or a local clan of limited landholdings, located in the village of Gokusho in the Niwa District of Owari Province. The Horio were descendants of the Takashina clan.
In this era, the Shiba clan served as the military governors of Owari, with Shiba Yoshimune serving as a shugo daimyō and the fourteenth head of the clan, while the Oda clan served as the deputy military governors. However, the Oda clan was divided into two branches: (i) the Iwakura-Oda branch (the Oda Ise-no-kami family), deputy military governors of the four upper districts of Owari, and (ii) the Kiyosu-Oda branch (the Oda Yamato-no-kami family), deputy military governors of the four lower districts of Owari. Yasutane, along with Yamauchi Moritoyo, served important roles for Oda Nobuyasu, the head of the Iwakura-Oda branch. There are historical documents jointly signed by Yasuharu and Yamauchi Moritoyo (the father of Yamauchi Kazutoyo) who served the same clan. After the Iwakura-Oda was eliminated, Yasuharu and his son, Yoshiharu, became rōnin, or masterless samurai.
The Iwakura-Oda were the lineal heirs to the Oda clan and therefore regarded to be in a superior position vis-à-vis the Kiyosu-Oda. Oda Nobutomo served as the deputy military governor of the Kiyosu-Oda family while Sakai Taizen served as his vice-deputy. The Kiyosu-Oda family was supported by three sub-branches, referred to as the Kiyosu sanbugyō, or three magistrates. These branches included the Inaba-no-kami family, the Tōzaemon family, and the Danjō-no-jō family. The Danjō-no-jō is also referred to as the Shobata-Oda clan. Oda Nobunaga originated from the Oda Danjō-no-jō sub-branch of the Kiyosu-Oda branch. Nobunaga and Nobuyasu were on friendly terms in their youth, but, later on, became alienated from one another. Nobuyasu sided with Saitō Yoshitatsu after Yoshitatsu killed Nobunaga’s father-in-law, Saitō Dōsan. Nobuyasu also supported Nobunaga’s younger brother, Oda Nobukatsu, who rebelled against Nobunaga. In 1558, Nobuyasu was ousted from Iwakura Castle by his eldest son, Oda Nobukata. Nobukata was subsequently defeated by Nobunaga at the Battle of Ukino, marking the end of the Iwakura-Oda branch of the family.
Following the collapse of the Iwakura-Oda, Yasutane’s movements are uncertain. He may have followed after his eldest son, Yoshiharu, began to serve under Toyotomi Hideyoshi. In 1599, Yasutane died and was succeeded by his grandson, Horio Tadauji.