Trần Nguyên Dục
Trần Nguyên Dục (died 1364), titled Prince Cung Túc, was the eldest son of Emperor Trần Minh Tông and Empress Hiến Từ and an elder brother of Emperor Trần Dụ Tông. His extravagance displeased his father, who passed him over for the throne when Hiến Tông died.
He took an entertainer's wife as a concubine and adopted her son Dương Nhật Lễ, raising him in the palace. When Dụ Tông died without an heir in 1369, his will gave the throne to Nhật Lễ, who ruled little more than a year before the Trần clan overthrew him in 1370.