The father of Donghai Emperor is the "Emperor" Rudolf Symbol of seven G1 championships, and his mother is Donghai Natural. Their pairing was not pre-planned. After the Emperor was born, he took his mother Tokai Roman's surname as Tokai, and his name was named "Emperor" by the owner, Masanori Uchimura. "Emperor" comes from the title "Emperor" symbolized by Rudo.