宋仁宗宝元元年(1038),元昊正式称帝,改元天授礼法延祚元年,国号大夏,史称西夏。
In the 1st year of Baoyuan ( 1038 ) , Li Yuanhao formally assumed the imperial title , designating his reign Yanzuo , and his dynasty , the Great Xia , was also known as the Western Xia in history .