Shiki Mizugaki Palace is considered to be the place where Emperor Sujin, the 10th emperor, carried out his imperial duties.
According to the Kojiki and Nihon Shoki (collectively known as the Kiki), there was a deadly plague that swept through the land during Emperor Sujin’s reign.
Receiving a divine message about what the great god Ōmononushi, the god of Mount Miwa, had done, the Emperor followed the god’s orders, and searched for the god’s descendant, Ōtataneko. Once found, the Emperor entrusted him to pray to the great god Ōmononushi, and it is said that this cured the land of the evil plague.
Aiming for peace in the land, the Emperor also the dispatched shogun to Tokai, Hokuriku, Saigoku, Tamba, and other regions, wisely ruling over the people. For this, he is honored as the first emperor to rule all of Japan

Stories from the Kojiki,Nihon Shoki, and Manyoshu(about Emperor Sujin)
“God of Mount Miwa, Ōmononushi”
“Wedding of the God of Mount Miwa”(“The Legend of the Odamaki Flower”)
“The Prayer to the God of Mount Miwa”, “The Legend of Motoise”
“The Legend of Hashihaka”, “The Dispatch of the Shido Shogun”
“The Presentation of Sacred Alcohol”