The area of Ashiya was part of ancient
Chikuzen Province.
Shell middens left by the
Jomon people are scattered around the midstream to the mouth of the ancient Onga River, and among these shell middens, one known as the Yamaga Shell Midden is particularly famous nationwide. In the late
Yayoi period, the area was called "Oka no Tsu" and was famous as one of the three major military ports, along with Toyotsu and Usa. At that time, it was a deep and vast bay, but due to the accumulation of earth and sand from the Onga River over the years and
land reclamation, there is no trace of what it once was. The name "Ashiya" appears in mid-
Heian period documents. In 1185, it was the site of the Battle of Ashiyaura in the
Genpei War. In the
Kamakura period, the port was regards as equal to that of
Shimonoseki. From the
Edo period, it prospered as a
post town on the highway to
Karatsu and was under the control of
Fukuoka Domain. After the
Meiji restoration, the village of Ashiya was established on May 1, 1889, with the creation of the modern municipalities system. It was raised to town status on June 10, 1891. However, railway lines bypassed the area (due to its proximity to the
Korean Peninsula and the
Sea of Japan, construction was avoided from a defense perspective), and the area gradually became isolated. ==Government==