The Heungdeok Jang clan, also known as the Heungseong Jang clan, is a Korean clan, with the bon-gwan (ancestral seat) based in Heungdeok-myeon, Gochang County, South Korea.
Background In the 2015 South Korean census, 37,423 individuals identified themselves as part of the Heungdeok Jang clan, and 21,973 individuals identified themselves as members of the Heungseong Jang clan, with a combined total of 59,396 members. The progenitor of the clan is considered to be Chang Yu (). He was from Sangjil-hyeon (modern-day Heungdeok).
Chang Yu would rise the position of gwangpyeong sirang. His son, Chang Yŏn-u, would serve the Goryeo government from the reign of King Seongjong to King Hyeonjong. He served as deputy minister of war and fought the Khitans at Tongju.
Members Chang Yŏn-u, Goryeo government official Chang Nok-su, Consort of King Yeonsangun of Joseon Chang Chi-ryang, 9th Chief of Staff of the Air Force Chang Dae-whan, South Korean businessman, son of Chang Chi-ryang
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