Trần Quốc Khang  Prince Tĩnh Quốc Trần Quốc Khang (1237–1300) was the first prince of the Emperor Trần Thái Tông, the eldest brother of Trần Thánh Tông and princes Trần Quang Khải, Trần Ích Tắc and Trần Nhật Duật. Although a son of Thái Tông in name, Trần Quốc Khang's father was actually Prince Hoài Trần Liễu, who was forced by grand chancellor Trần Thủ Độ to give up his wife, Princess Thuận Thiên, to his younger brother Thái Tông when she was already pregnant with Trần Quốc Khang. For this reason, Trần Quốc Khang was not chosen as successor of Thái Tông for the throne and he did not have a significant role in royal court either, as his younger brothers did. Afterwards he was appointed as governor of Nghệ An, a position that his descendants inherited. Since Trần Quốc Khang was in fact a son of Trần Liễu, he was also a natural brother of general Trần Hưng Đạo, commander-in-chief of Đại Việt army. Trần Quốc Khang was born in 1237 as the first son of the Emperor Trần Thái Tông and his new empress Thuận Thiên. According to "Đại Việt sử kí toàn thư", Thái Tông and his wife, the Empress Chiêu Thánh, did not have their first son for a while. This situation made grand chancellor Trần Thủ Độ worried, because he had profited from the same circumstance with the Emperor Lý Huệ Tông to overthrow the Lý Dynasty and create the Trần Dynasty.