Before revision: 1220 The Khasa Kingdom expands into the territory of Garhwal and Kumaon 1230 Khabpa (Prince of Khab) establishes himself as ruler of Mangyül Gungthang 1239 The Khasa Kingdom defeats Mangyül Gungthang 1240 Mongol invasions of Tibet: Doorda Darkhan sacks Reting Monastery; a proxy administration is set up at Drigung Monastery 1252 Mongol invasions of Tibet: Qoridai invades Tibet as far as Dangquka 1253 Kublai Khan meets Drogön Chögyal Phagpa and promotes the Sakya school of Tibetan Buddhism References Bibliography .
After revision: 1220 The Khasa Kingdom expands into the territory of Garhwal and Kumaon 1230 Khabpa (Prince of Khab) establishes himself as ruler of Mangyül Gungthang 1239 The Khasa Kingdom defeats Mangyül Gungthang 1240 Mongol invasions of Tibet: Doorda Darkhan sacks Reting Monastery; a proxy administration is set up at Drigung Monastery 1252 Mongol invasions of Tibet: invades Tibet as far as Dangquka 1253 Kublai Khan meets Drogön Chögyal Phagpa and promotes the Sakya school of Tibetan Buddhism References Bibliography .