The area around present-day Toyohashi has been inhabited for many thousands of years. Archaeologists have found human remains from the Japanese Paleolithic period, which have been carbon dated to more than 10,000 BC along with the bones of Naumann elephants. Numerous remains from the Jomon period, and especially from the Yayoi and Kofun periods have also been found, including many kofun burial mounds.
During the Nara period, the area was assigned to Atsumi, Hoi and Yana Districts of Mikawa Province and prospered during subsequent periods as a post town on an important river crossing of the T?kaid? connecting the capital with the eastern provinces. During the Sengoku period, the area was a highly contested zone between the Imagawa clan based in Suruga Province and various local warlords, who built a number of fortifications in the area, including Yoshida Castle. The rising power of the Matsudaira clan and its alliance with Oda Nobunaga eventually neutralized the threat posed by the Imagawa, and the area became part of the holdings of Tokugawa Ieyasu. Following the Battle of Odawara in 1590, Toyotomi Hideyoshi ordered the Tokugawa clan to relocate to the Kant? region and assigned the castle to Ikeda Terumasa. Ikeda developed the surrounding castle town and embarked on a massive and ambitious plan to rebuild Yoshida Castle. However, following the Battle of Sekigahara, he was relocated to Himeji Castle.
After the establishment of the Tokugawa shogunate, Yoshida Castle became the center of Yoshida Domain, a clan fief. The domain was assigned to several different fudai daimy? clans until coming into the possession of the Matsudaira (Nagasawa-?k?chi) clan in 1752, which remained in residence at Yoshida until the Meiji Restoration. The final daimy? of Yoshida, Matsudaira Nobuhisa, surrendered the domain to the Meiji government in 1868. In 1869, the name of the domain was formally changed from Yoshida to Toyohashi.
With the establishment of the
