呉権
In 944, before his death, Ngô Quyền had Dương Tam Kha become regent for his son, Ngô Xương Ngập. But after the demise of Ngô Quyền, he forced his nephew-in-law to abdicate and installed himself as king, calling himself Dương Bình Vương (King Ping of Yang). Ngô Xương Ngập fled to Trà Hương village (modern Hải Dương Province) and was hidden by a chieftain (Hào trưởng) of area named Phạm Lệnh Công. "Hào trưởng" is a title for a honored man who is leader of his kin and also of a large area around his base during early independent Vietnam. Thanks to his efforts, Ngô Xương Ngập was in safety. Afterward, Dương Tam Kha adopted Ngô Xương Văn, the second son of Ngô Quyền. During his reign, prospered economically and freely developed its own regional culture that continues to this day. He developed the coastal kingdom's agriculture, built seawalls, expanded crops in Hà Tây, dredged rivers and lakes, and encouraged sea transport and trade in Nam Định.