During the late
Heian period and
Muromachi period, the area of modern Kuwana was known as and was a major seaport on
Ise Bay, controlled by a guild of merchants. The poet
Socho described it in 1515 as a major city with over a thousand houses, temples and inns. The port was protected by three fortifications, (Higashi Castle, Nishi Castle, Misaki Castle) which made up what was known as the “Three Castles of Kuwana”. During the
Sengoku period, the area came under the influence of the
Ikkō-ikki movement centered at
Nagashima. After the
Ikkō-ikki were exterminated by
Oda Nobunaga, the Kuwana area was awarded to his general
Takigawa Kazumasa. After Nobunaga's death, Takigawa opposed
Toyotomi Hideyoshi and lost his territories. For a time,
Oda Nobukatsu held the area, but was dispossessed by Hideyoshi following the
Battle of Odawara. In 1595, Hideyoshi assigned
Ujiie Yukihiro a 22,000
koku domain, but he was dispossessed by
Tokugawa Ieyasu after the
Battle of Sekigahara.
Tokugawa Ieyasu realized the strategic importance of Kuwana in the ongoing struggle against the
Toyotomi clan in
Osaka due to its location at the mouth of
Nagara River on the western side of the Nagashima delta area formed by the
Kiso River, Nagara River and
Ibi River. This meant that any travelers on the vital
Tōkaidō highway connecting
Edo with
Kyoto had to pass through Kuwana in order to take a boat from Kuwana port to
Atsumi Peninsula in
Owari Province, as there were no bridges. Ieyasu reassigned
Honda Tadakatsu from
Otaki Castle in
Kazusa Province to Kuwana and ordered him to construct a large fortification on the riverbank on what was roughly the site of the old Higashi Castle. Under the Honda,
Kuwana-juku developed as a prosperous
post town. ==Structure of Kuwana Castle==