Ehime Prefecture is a prefecture in northwestern Shikoku, Japan. The capital is Matsuyama. Until the Meiji Restoration, Ehime Prefecture was known as Iyo Province. Since before the Heian period, the area was dominated by fishermen and sailors who played an important role in defending Japan against pirates and Mongolian invasions. After the Battle of Sekigahara, the Tokugawa shogun gave the area to his allies, including Kato Yoshiaki who built Matsuyama Castle, forming the basis for the modern city of Matsuyama. The name Ehime comes from the kuniumi part of the Kojiki where Iyo Province is mythologically named Ehime "lovely princess."