Emperor Ankō (安康天皇) was the 20th imperial ruler of Japan. No firm dates can be assigned to this emperor or to his reign, but he is believed to have ruled the country during the mid-5th century CE.
According to Kojiki and Nihonshoki Anko was the second son of Ingyo. His elder brother Kinashikaru-no-miko (Prince Kinashi-karu) was the crown prince but due to an incestuous relationship with his half-sister, Kinashi-karu lost favour with the court. After an aborted attempt to rally troops against Anko, Kinashi-karu (and his half-sister) committed suicide.
Anko was assassinated in his third year of reign by Mayowa-no-ookimi (Prince Mayowa), in retaliation for the execution of Mayowa's father.
