 The uneasy arrangement would persist until 1297 . The Mongols continued to occupy northern Burma to <unk> as the province of <unk> ( Cheng @-@ Mien ) but ended the fictional central Burma province of <unk> on 18 August 1290 . Meanwhile , the power struggle in central Burma continued with the three brothers blatantly consolidating support . To check their rising power , <unk> submitted to the Mongols in January 1297 , and was recognized by the Yuan emperor <unk> Khan as King of Pagan on 20 March 1297 . The emperor also gave Chinese titles to the brothers as subordinates of <unk> . The brothers resented the new arrangement as it directly reduced their power . On 17 December 1297 , the three brothers overthrew <unk> , and founded the <unk> Kingdom . The dethronement forced the Mongol government to intervene again , leading to the second Mongol invasion of Burma ( 1300 – 01 ) . The invasion failed . Two years later , on 4 April 1303 , the Mongols abolished the province of <unk> ( Cheng @-@ Mien ) , evacuated <unk> , and returned to Yunnan . 
