From the Old Stone Age to the Present
Obu has many ruins, including the Kyoei remains, the oldest in the city and from which stone ware from the Old Stone Age was found, Koyasu Shrine remains from the latter half of the Yayoi Period, and Sosaku remains dating from the Kofun Period. At the Sosaku remains, you can learn about the daily life of people who lived in the Sakai River basin. During the warring states period, battles took place at the Ishigase River between the Oda and Imagawa clans and between the Mizuno and Matsudaira clans. There are many traces of those warring times, including Oiwake Castle, Yokone Castle and kubizuka (i.e. burial mounds for severed heads).
Seven villages joined together in the 39th year of the Meiji Era (A.D.1906) to form Obu Town, whose area was the same as the present city. In the September of the 45th year of Showa (A.D. 1970), the City of Obu was established as the 24th city in the prefecture. At the Obu History and Folklore Museum, a restored private house from the early Meiji Era is on exhibition, with life-size figures of a farming family making straw ropes and weaving. It also exhibits artefacts including cultural properties, relics from ancient sites and historical data, to help visitors learn the history of Obu while finding out how people of that time lived.
Oiwake Castle Ruins
It is said that Oiwake Castle was built in the 2nd year of Eiroku (A.D. 1559)by Awajinokami Inagaki. According to ancient documents, the castle was approx. 66 meters from east to west, and approx. 84 meters from north to south.
Yoshikawa Castle Ruins
Built by Nyudo Yoshikawa in the 4th year of Oei (A.D. 1397), and later inhabited by Kanpachi Hanai. It is said that the castle was ruined in the 8th year of Tensho (A.D. 1580).
Old Kiln Ruins
Ruins of kilns used to bake ceramic works between the 10th to 13th centuries are scattered here and there on the slopes of hills in and around the city.
A legendary spot where Kobo Daishi(Kukai) stayed in the 5th year of Konin(A.D. 814) on his travels from Mikawa to Owari.
The site of battles that took place between the clans of Oda and Imagawa and Mizuno and Tokugawa during the four years beginning in the 1st year of Eiroku (A.D. 1558)
Built in the Edo period to ensure the safety of the village. This stone lantern was lit through the night. They can still be seen in Kitao and Yoshida.
Excavations and investigation were carried out in 1970 and 1971, and earthenware vessels from the Yayoi, Nara and Heian Eras were found.
Ends of stone arrows from the Old Stone Age were discovered here.
Koyasu Shrine Remains
Excavations and investigation were carried out in 1982 and 1983, and many small-sized earthenware vessels from the Yayoi and Kofun Eras, used especially in ancient rituals, were found.