Lifespan: Tenbun 6 (1537) to 2/24 of Keichō 18 (1613)
Rank: daimyō; lord of Kōkokuji Castle
Lord: Tokugawa Ieyasu → Tokugawa Hidetada
Father: Amano Kagetaka
Wife: Daughter of Ushida Yukimasa
Children: Yasumune, Yasukatsu, Yasuyo, Yasuyoshi, daughter (formal wife of Oguri Tadamasa), daughter (wife of Sakakibara Tadazane)
Amano Yasukage became a daimyō while serving as a retainer for the Tokugawa clan. He was lord of Kōkokuji Castle and managed a domain in Suruga Province.
Yasukage was born as the son of Amano Kagetaka. Yasukage worked from a young age as a servant close to Tokugawa Ieyasu, accompanying Ieyasu even when he became a hostage. In 1563, he supported Ieyasu in conflict with monks from the Ikkō-ikki religious band in Mikawa that included members of the Amano family. Yasukage is known as one of the Three Magistrates of Mikawa, along with Honda Shigetsugu and Kōriki Kiyonaga. Shigetsugu was referred to as dauntless, Kiyonaga as generous, and Yasukage as deliberate.
In 1586, Yasukage was assigned command of the ninja from Koga Province and allocated a territory of 2,200 kan. After Ieyasu moved to the Kantō, Yasukage received a domain of 3,000 koku in Shimōsa Province, and further assigned the role of a machi-bugyō in Edo, as an official administrator of the municipal areas of the territory. In 1601, he further expanded holdings with 10,000 koku as lord of the domain for Kōkoku Temple. Yasukage made efforts toward the development of agriculture and riparian areas. In 1607, a stockpile of bamboo was stolen. The incident escalated to the point that the retainer in charge of preventing the theft killed peasants who appeared to be involved in the crime. This led to an argument between the local official who had summoned the suspects who were killed and the locals, who appealed directly to Ieyasu. Ieyasu did not regard Yasukage as someone who would make a groundless argument. Upon a confidential request from Ieyasu, Honda Masazumi visited Yasukage and was convinced that Yasukage had done nothing wrong; however, he did not respond favorably to a request from Masazumi to handover suspects. In the end, Yasukage fled together with his son, Yasumune, and his domain seized.
Later, Yasukage entered the Sainen Temple, and died there in 1613. In 1628, Yasumune was pardoned and received 1000 bales of rice, and the Amano clan was permitted to continue as a hatamoto, or retainer of the Tokugawa with a fief of up to 1000 koku.