King Jinheung’s Border Steles
King Jinheung toured his new lands and raised steles at Bukhansan, Changnyeong, Hwangchoryeong and Maunryeong.

Ethan Doyle White · CC BY-SA 4.0 · Source
Sunsu steles were raised by the king as he toured newly won lands. Changnyeong (561) faces Gaya, Bukhansan the lower Han, and Hwangchoryeong and Maunryeong (568) mark the advance into Hamgyeong; on the last two the king calls himself zhen, the imperial "We".
Long thought to be a monument to the monk Muhak, the Bukhansan stele was identified by Kim Jeong-hui in 1816 and recorded in his Geumseok gwaan-rok; it is now in the National Museum of Korea. Some classify the Changnyeong stele as a frontier-expansion stele rather than a touring stele.