 The Tangs in Lung Yeuk Tau (), in Fanling, have the strongest claim to the royal descent among their fellow clansmen, because they are the descendants of Tang Lum (), the eldest son of the princess of the southern Song Dynasty (1127–1279).The father of the princess was Emperor Gaozong of Song (June 12, 1107 – November 9, 1187), born Zhao Gou, was the tenth emperor of the Song Dynasty of China, and the first emperor of the Southern Song.He reigned from 1127 to 1162.