Lifespan: Tenbun 16 (1547) to 8/9 of Genna 6 (1620)
Rank: bushō, sengoku daimyō
Title: Vice Minister of Central Affairs
Clan: Rokkaku, Ōhara clan
Father: Rokkaku Yoshikata
Siblings: Yoshiharu, Yoshisada, sister (formal wife of Hatakeyama Yoshitsuna)
Children: Takayoshi, Takakazu, Aoji Tōjō
Rokkaku Yoshisada served as a sengoku daimyō from the Sengoku to early Edo periods. Yoshisada served as a sengoku daimyō of southern Ōmi Province. He was the seventeenth head of the Rokkaku clan. Yoshisada was also referred to as Sasaki Jirō and had the other names of Takasada, Katanaga, and, possibly, Takamori.
In 1547, Yoshisada was born as the son of Rokkaku Yoshikata, the sengoku daimyō of southern Ōmi.
Initially, Yoshisada succeeded his great uncle, Ōhata Takayasu and adopted the surname of Ōhara. His older brother, Rokkaku Yoshiharu, executed a senior retainer, Gotō Katatoyo and his son, Gotō Iki-no-kami, at the base of the Rokkaku clan at Kannonji Castle. This event is known as the Kannonji Disturbance, leading to a loss of control over the band of retainers. Upon orders of Yoshikata, Yoshisada was designated as the heir to the clan in lieu of Yoshiharu, although there is an alternate theory that he did not succeed to the headship of the clan.
Before long, after Oda Nobunaga invaded the territory of the Rokkaku in southern Ōmi, Yoshisada joined his father and older brother by holing up in Mitsukuri Castle to resist, but the stronghold of Kannonji Castle fell to the attacking forces. Together with his father and older brother, he fled into the mountains in the Kōka District of Ōmi, and continued their resistance to Nobunaga through events such as the Genki Disturbance. When his father, Yoshikata, sent a letter to Anayama Nobutada, a member of the Kai-Takeda clan, Yoshisada served as the messenger.
In 1582, in connection with the Kōshū Expedition by the Oda clan, numerous defeated lords sought refuge in Kai Province. These included, among others, Wakasa-Takeda Gorō, Oda Nobukiyo of Inuyama, Toki Yoriaki of Mino, and an individual named Sasaki Jirō. This is considered a reference to Yoshisada. There is a theory this person was apprehended and murdered, as well as a theory that this was a different person from the same Sasaki clan. Moreover, in historical records, references to Sasaki Jirō appear again in 1600. There is an account of him meeting Toyotomi Hideyori several years later. At this time, there is a record that he met with the family of Rokkaku Yoshisato, a retainer of Hideyori.
Yoshisada died in 1620.