Following a seventeen-year-long campaign, Vijayabahu I successfully drove the Chola out of Sri Lanka in 1070, reuniting the country for the first time in over a century. Upon his request, ordained monks were sent from Burma to Sri Lanka to re-establish Buddhism, which had almost disappeared from the country during the Chola reign. During the medieval period, Sri Lanka was divided into three sub-territories, namely Ruhunu, Pihiti and Maya.