Rise of Yŭn.... rebellion against China.... siege of Keuk Fortress raised.... Ko-gu-ryŭ surrenders to Yŭn.... Ko-gu-ryŭ disarmed.... Japanese attack Sil-la.... Păk-je’s victory over Ko-gu-ryŭ.... moves her capital across the Han.... Păk-je people in Sil-la.... Yŭn is punished.... Buddhism introduced into Ko-gu-ryŭ.... and into Păk-je.... amnesty between Ko-gu-ryŭ and Păk-je.... but Ko-gu-ryŭ continues the war.... Păk-je in danger.... envoy to Japan.... Ch’ŭm-nye usurps the throne of Păk-je.... and is killed.... Sil-la princes rescued.... Ko-gu-ryŭ and Păk-je receive investiture from China.... China’s policy.... Nul-ji’s reign.... Ko-gu-ryŭ and Păk-je transfer their allegience.... Yŭn extinct.... beginning of triangular war.... diplomatic relations.... Ko-gu-ryŭ falls from grace.... first war vessel.... diplomatic complications.... Păk-je humiliated.... her capital moved. We have now come to the events which marked the rise of the great Yŭn power in Liao-tung. They are so intimately connected with the history of Ko-gu-ryŭ that we must give them in detail. For many years there had been a Yŭn tribe in the north but up to the year 320 it had not come into prominence. It was a dependency of the Tsin dynasty of China. Its chiefs were known by the general name Mo Yong. In 320 Mo Yong-we was the acting chief of the tribe. He conceived the ambitious design of overcoming China and founding a new dynasty. The Emperor immediately despatched an army under Gen. Ch’oe-bi to put down the incipient rebellion. Ko-gu-ryŭ and the U-mun and Tan tribes were called upon to render assistance against the rebels. All complied and soon the recalcitrant chieftain found himself besieged in Keuk Fortress and was on the point of surrendering at discretion when an event occurred which, fortunately for him, broke up the combination and raised the siege. It was customary before surrendering to send a present of food to the one who receives the overtures of surrender. Mo Yong-we, in pursuance of this custom, sent out the present, but for some reason it found its way only into the camp of the U-mun forces while the others received none. When this became known the forces of Ko-gu-ryŭ, believing that Mo Yong-we had won over the U-mun people to his side, retired in disgust and the Chinese forces, fearing perhaps a hostile combination, likewise withdrew. The U-mun chiefs resented this suspicion of treachery and vowed they would take Mo Yong-we single-handed. But this they could not do, for the latter poured out upon them with all his force and scattered them right and left. From this point dates the rise of Yŭn. Gen. Ch’oe-bi fearing the wrath of the Emperor fled to Ko-gu-ryŭ where he found asylum. Here the affair rested for a time. The kingdom of Yŭn forebore to attack Ko-gu-ryŭ and she in turn was busy strengthening her own position in view of future contingencies. Ten years passed during