Many artefacts and historic sites from the prehistoric age show that a settlement of settlers had already been formed in Ulju-gun in the prehistoric age. Jungsan-ri, Nongso-myeon (now Nongso 2-dong, Buk-gu, Ulsan), Ijeon-ri, Dudong-myeon, Dagae-ri, Eonyang-eup, Samgwang-ri, Onyang-eup, Daedae-ri, Ungchon-myeon, as well as Janghyeon-dong, Ulsan-si (now Byeongyeong 2-dong, Jung-gu) Hwangbangsan Mountain and the military barracks castle site, Comb-pattern earthenware remains were found.In addition, remains from the Bronze Age, such as ancient tombs in Daun-dong and recently, stone carvings in Cheonjeon-ri, Dudong-myeon and Bangudae Petroglyphs in Daegok-ri, Eonyang-eup, have been discovered.It was called Gulahwachon(屈阿火村) during the Samhan era, and King Pasa of Silla acquired this place and established the subdivision of Gulahwahyeon(屈阿火縣). In 757, (the 16th year of King Gyeongdeok), the name was changed to Hagok(河曲), and it was made the into a subdomain the county of Imgwan-gun, which was in the Mohwa region of Wolseong-gun.According to the geography section of 『Goryeosa』, “During the reign of King Taejo of Goryeo, due to the great achievements of the villager Park Yun-ung, Hagok-hyeon, Dongjin-hyeon (the area around Gangdong-myeon), Ugchon-myeon and Ungsang-myeon (Yangsan-gun) were Heungnyebu (興禮府) was established by combining Punghyeon.”
