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.