Duke Gangyang

Duke Gangyang or Prince Gangyang (died 1308; born Wang Cha) was a Goryeo Royal Prince as the first and oldest son of King Chungnyeol and Princess Jeongsin, also great-grandfather of its last monarch, King Gongyang.

Palace life
As the oldest son and since his mother was King Chungnyeol's first wife, Wang Cha was the one who should become the crown prince. Yet, due to Yuan dynasty influence on Goryeo after the king's marriage with Kublai Khan's daughter–Qutugh Kelmysh, Wang Cha must give up the crown prince position to his half younger brother.

In 1279 (5th years reign of his father), Wang Cha had to go to the Dongsim Temple in Aju, Chungcheong-do (now Asan-si, South Chungcheong Province) to avoid conflict with the crown prince. Four years later in 1283, Wang Cha was able to back to Gaegyeong and received his royal title–Duke Gangyang.

Death and afterlife
Duke Gangyang died in 1308 (24th years reign of his father) and received his Posthumous name, Jeonggang along with his honorary title, Duke Jeonggang  given by his great-grandson–King Gongyang in 1391.

Although his wife is unknown, according to the remaining historical sources, Duke Gangyang had 3 sons: Wang Hu the Grand Prince Danyang who served in Yuan dynasty, Wang Ko the Prince Yeonan  who was King Chungseon's trusted official, and Wang Hun the Prince Yeondeok  who would become the grandfather of King Gongyang.