Lifespan: Keichō 1 (1596) to 12/22 of Genna 1 (1622)
Bakufu: Tokugawa – second head of Echigo-Takada domain
Father: Hori Hideharu
Mother: Daughter of Hasegawa Hidekazu
Siblings: Tadatoshi, Tsuruchiyo, Kisato
Wife: [Formal] Kunihime (Eiju-in) – natural daughter of Honda Tadamasa and adopted daughter of Tokugawa Ieyasu
Hori Tadatoshi served as a daimyō during the early Edo period. Tadatoshi was the second head of the Takada domain in Echigo Province. This is also referred to as the Fukushima domain. He was the eldest son of Hori Hideharu, the first head of the domain. His mother was the daughter of Hasegawa Hidekazu. His formal wife was Kunihime (Eiju-in) the natural daughter of Honda Tadamasa, the head of the Himeji domain (an adopted daughter of Tokugawa Ieyasu). His son was Hori Hidetoshi.
In 1606, following the death of Hideharu, Tadatoshi inherited the headship of the clan. Owing to the efforts of the chief retainer, Hori Naomasa, he wed Kunihime. Tadatoshi received one of the characters in his name from Tokugawa Hidetada as well as the Matsudaira surname. To ensure the continuity of his family, he quickly forged relations with the Tokugawa shōgun family. However, in the wake of the death of Naomasa in 1610, an internal conflict erupted between two elders in the family – Hori Naokiyo and Hori Naoyori. Owing to his failure to resolve the situation, on 2/2 of the same year, the Tokugawa bakufu removed Tadatoshi and Naokiyo from their positions and assigned a reduced fief of 10,000 koku to Naoyori. This event is known as the Echigo-Fukushima Disturbance.
Following his demotion, Tadatoshi was sent to Torii Tadamasa, the head of the Mutsu-Iwakitaira domain, where he entertained himself practicing the tea ceremony. He died at the age of twenty-six.
Tadatoshi’s younger brother, Hori Tsuruchiyo, died at the age of nine, while his next younger brother, Hori Kisato, served the Naitō family of the Hyūga-Nobeoka domain in Kyūshū. His son, Hidetoshi, served the Maeda family associated with the Kaga domain.
Meanwhile, the former elder, Naoyori, made steady progress, constructing Nagaoka Castle and contributing to the development of the town of Niigata. He also promoted growth of the town below Murakami Castle in Echigo. The lineage of Naoyori’s second son, Hori Naotoki, called the Echigo-Muramatsu domain with a fief of 30,000 koku, along with the lineage of Naoyori’s fifth son, Hori Naoyuki, called the Echigo-Shiiya domain with a fief of 10,000 koku, continued until the Meiji Restoration.