Wareru (, ; 1253–1307) was the founder of the
Ramanya Kingdom located in today's
Lower Burma (Myanmar). The kingdom is more commonly known as Kingdom of Hanthawady Pegu (Bago), or simply Pegu although the kingdom's first capital was
Martaban (Mottama). By using both diplomatic and military skills, the commoner of
Shan and
Mon descent successfully carved out a kingdom for the Mon people in
Lower Burma following the collapse of the
Pagan Empire in 1287. Wareru was nominally a
vassal of his father-in-law
Ram Khamhaeng of
Sukhothai, and of the
Mongols, and successfully repulsed attacks by the
Three Shan Brothers of
Myinsaing in 1287 and 1294.