Kao-li

In A.D. 436 we find from the Kang Kien that Fêng Hung (馮弘) the last “Emperor” of Yen⁶² had to take refuge in the Tungusic (東胡) kingdom of Kao-li,—the very first mention of the new name,⁶³—which had been developing quietly at its capital P’ing-jang.[…] “The Emperor visited east-central China (江與京洛), and enlisted 400,000 soldiers and 500 Wu ships to cross the seas and go to P’ing-jang, (the Kao-li capital).”

1890, E. H. Parker, “On Race Struggles in Corea”, in Transactions of the Asiatic Society of Japan, volume XVIII, Tokyo: The Hakubunsha, →OCLC, pages 192–193, 218

In ancient times there existed in the region of the Tung-chia River 佟佳江 in present Liaoning a people called Kao-chü-li 高句驪. In the fifth century they moved their capital to P’ing-jang. The name of the country was simplified to Kao-li 高麗 (Korea).

1949, Karl August Wittfogel, Fêng Chia-Shêng, “Translation: Tribes”, in History of Chinese Society Liao (907–1125), American Philosophical Society, →OCLC, page 104

Among investigations of ancient sites made by Japanese scholars in the Korean Peninsula during the past forty yeas, there are some which have attracted the attention of scholars of the world. One of these was the excavation of the Lo-lang sites of the Han dynasty centering about Heijōᵃ (P'ing-jang); the other was the discovery of the Kao-kou-li tombs with wall paintings in the neighborhood of Heijō and in the vicinity of T'ung-kou, Chi-an shêng,ᵇ Manchuria, in the north.

[1952, Suyeji Umehara, “The Newly Discovered Tombs with Wall Paintings of the Kao-kou-li Dynasty”, in Archives of the Chinese Art Society of America, volume 6, →ISSN, →OCLC, page 5