Dðáng Tam Kha () or Dðáng Tam Ca, formally King Bình of Dðáng (), later known as the Duke of Chðáng Dðáng (ç« é½堬) (died 10 August 980), was king of the Ngô dynasty from 944 to 950.
Dðáng Tam Kha was one of Dðáng ÃÂình Nghá»Â's sons, brother of Ngô Quyá»Ân's wife, empress Dðáng. According to ÃÂại Viá»Ât sá» lðợc (History annals of Dai Viet), his birth name was Dðáng Chá»§ Tðá»Âng (), but according to History of Song, his name was Dðáng Thiá»Âu Há»Âng (). Some historians claimed that he was the third son of Dðáng ÃÂình Nghá»Â, after Dðáng Nhất Kha and Dðáng Nhá» Kha.
He was a subordinate general of Khúc Hạo in the area of Aizhou (now Thanh Hóa Province). In 931, Dðáng ÃÂình Nghá» defeated Southern Han ruler Li Tian, retook the capital of ÃÂại La (former name of Hanoi), proclaimed himself Jiedushi (equivalent to Military governor) of Ténh Hải quân. Dðáng Tam Kha became a subordinate general of his father.
Six years later, Kiá»Âu Công Tiá» n, also a general of Dðáng ÃÂình Nghá»Â, mutinied and killed his master in order to become governor of Jinghao. In 938, Ngô Quyá»Ân, son-in-law and also former general of Dðáng ÃÂình Nghá» defeated the potency of Kiá»Âu Công Tiá» n and also killed him. After that, Dðáng Tam Kha follow Ngô Quyá»Ân as his general.
As the Ngô Quyá»Ân march his forces to ÃÂại La, Kiá»Âu Công Tiá» n sent the envoys to Southern Han to petition for sending army to help himself. Emperor of Southern Han, Liu Yan, commissioned his son, Liu Hongcao to help Kiá»Âu Công Tiá» n, he also led another army to supply his son. But Công Tiá» n was executed before this army arrived. In the November 938, at the Battle of Bạch ÃÂằng, the fleet was defeated by Ngô Quyá»Ân, Liu Hongcao was killed in battle. Dðáng Tam Kha participated in this battle.
In 944, before his death, Ngô Quyá»Ân had Dðáng Tam Kha become regent for his son, Ngô Xðáng NgáºÂp. But after the demise of Ngô Quyá»Ân, he forced his maternal nephew to abdicate and installed himself as king, calling himself Dðáng Bình Vðáng (King Ping of Yang). Ngô Xðáng NgáºÂp fled to TràHðáng village (modern Hải Dðáng Province) and was hidden by a chieftain (Hào trðá»Âng) of area named Phạm Lá»Ânh Công. Hào trðá»Âng 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 Xðáng NgáºÂp was in safety. Afterward, Dðáng Tam Kha adopted Ngô Xðáng VÃÂn, the second son of Ngô Quyá»Ân. 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 HàTây, dredged rivers and lakes, and encouraged sea transport and trade in Nam ÃÂá»Ânh.
In 950, Dðáng Tam Kha forced Ngô Xðáng VÃÂn to quell the rebellion of two villages ÃÂðá»Âng and Nguyá» n in Thái Bình Province, but he turned his army to dethrone Dðáng Tam Kha. Although Dðáng Tam Kha dethroned his brother after the death of his father, Ngô Xðáng VÃÂn spared, but degraded him to Duke of Chðáng Dðáng.
He spent his later years reclaiming new land called Giao Thá»§y (Nam ÃÂá»Ânh) with his family and followers. Some historic evidence showed that he was the father of Empress Dðáng Vân Nga who married ÃÂinh Bá» Lénh in 966. She would eventually become the last ruler of the ÃÂinh family who would rule as dowager empress in her son's name, eventually giving rise to the Lê family through her marriage to Lê Hoàn in 980.