Rediscovery
The stele's location, in Ji'an in the northeastern Chinese province of Jilin, was key to its long neglect. Following the fall of Goguryeo in 668, and to a lesser extent the fall of its successor state Balhae in 926, the region drifted outside the sway of both Chinese and Korean geopolitics. Afterwards the region came under the control of numerous Manchurian states, notably the Jurchen and from the 16th century the Manchu. When the Manchu conquered China in 1644 and established their hegemony, they guarded their ancestral homeland in Manchuria, prohibiting movement there by any non-Manchu peoples. This seclusion came to an end at the end of the 19th century, when the region was opened up for Han Chinese emigration. Manchuria thereafter became the coveted prize of vying regional powers, notably Russia and Japan for its rich natural resources and strategic location.
The opening up of Manchuria also resulted in the influx of Chinese and Japanese scholars, the latter often supplemented by Japanese spies traveling incognito to spy the region's fortifications and natural layout, prescient of a future of increased international rivalry. In the late 19th century many new arrivals to the region around Ji'an began making use of the many bricks and baked tiles that could be found in the region to build new dwellings. The curious inscriptions on some of these tiles soon reached the ears of Chinese scholars and epigraphers. Many were found to bear an inscription in ancient Chinese script reading:
"May the mausoleum of the Great King be secure like a mountain and firm like a peak."
It was around 1875 that an amateur Chinese epigrapher Guan Yueshan, scrounging for more samples of such tiles around Ji'an, discovered the mammoth stone stele of Gwanggaeto obscured under centuries of mud and overgrowth.
The clearing away of the stele's face invariably led to the damaging of its engraved text. Almost every inch of the stele's four sides were found be covered with Chinese characters (nearly 1800 in total), each about the size of a grown man's hand. The discovery soon attracted scholars from Japan, Russia, and France. In 1883 a young Japanese officer named Sakō Kageaki traveling in the guise of an itinerant Buddhist monk arrived in Ji'an. Sakō had been ordered from his last post in Beijing to proceed back to Japan via Manchuria and to make detailed observations there of the region's layout. It was while traveling through Liaoning that he apparently heard of the stele's recent discovery and managed to procure an ink rubbing of the stele's face to carry back to his homeland. It was scholars in Japan who were to make the first detailed analysis of the stele's ancient text.
Read more about this topic: Gwanggaeto Stele