Rajasa was the ruling
dynasty of
Singhasari kingdom and later
Majapahit empire in 13th to 15th century eastern
Java. The rulers of Singhasari and Majapahit trace their origins back to the mysterious figure of
Ken Arok or Sri Ranggah Rajasa, who founded the Rajasa dynasty early in the 13th century. According to the
Pararaton, Ken Arok was born in the Tumapel region (present day
Malang,
East Java). He was considered as the dynasty founder of both the Singhasari and Majapahit line of monarchs.