Lifespan: Genki 1 (1570) to 1/11 of Genna 10 (1624)
Title: Junior Fifth Rank (Lower)
Lord: Tokugawa Ieyasu → Tokugawa Hidetada
Father: Abe Masakatsu
Mother: Daughter of Ebara Sadaji
Siblings: Sister, Masatsugu, Tadayoshi, wife of Nagai Naokatsu, Masayo
Wife: [Formal] Daughter of Ōsuga Yasutaka, consorts
Children: Sōtarō, wife of Torii Tadayori, Tadaaki, Hikosaburō
Abe Tadayoshi served as a retainer of the Tokugawa clan in the Azuchi-Momoyama period, and as a hatamoto and elder of the Edo bakufu in the Edo period.
Tadayoshi was born in 1570 as the second son of Abe Masakatsu. In 1586, he became the son-in-law of Ōsuga Yasutaka, a friend of Masakatsu and retainer of Tokugawa Ieyasu, and moved to Yokosuka Castle in Tōtōmi Province in Yasutaka’s domain. In 1590, Tadayoshi joined in the Odawara Expedition as a commanding officer under Yasutaka. The conflict witnessed a massive contingent of Toyotomi and Tokugawa forces against the Gohōjō that led to the surrender of the Gohōjō. Tadayoshi killed two enemy forces, but suffered a wound from a firearm.
In 1599, Tadayoshi became an okachi-gashira, or lower-ranking bushi. In 1614, he participated in the Ōsaka no jin, or Siege of Ōsaka. In the Summer Siege of Ōsaka, Tadayoshi and Obata Kagenori contributed to the effort by overcoming the enemy defenses at Okayama. In 1616, following the death of Tokugawa Ieyasu, Tadayoshi went to Edo and served his successor, Tokugawa Hidetada. Tadayoshi served as an official at the reburial of Ieyasu at the Rinnō Temple on Mount Nikko in Shimotsuke Province. Thereafter, his received an increase of his fief to 5,000 koku and was promoted to the role of an ōban-gashira, or unit commander of hatamoto, or soldiers of the Edo bakufu.