Analysis of information sources in references of the Wikipedia article "Koreans in China" in English language version.
Korea held a dominant position in the northeastern seas.
From what Ennin tells us, it seems that commerce between East China, Korea and Japan was, for the most part, in the hands of men from Silla. Here in the relatively dangerous waters on the eastern fringes of the world, they performed the same functions as did the traders of the placid Mediterranean on the western fringes. This is a historical fact of considerable significance but one which has received virtually no attention in the standard historical compilations of that period or in the modern books based on these sources. . . . While there were limits to the influence of the Koreans along the eastern coast of China, there can be no doubt of their dominance over the waters off these shores. . . . The days of Korean maritime dominance in the Far East actually were numbered, but in Ennin's time, the men of Silla were still the masters of the seas in their part of the world.
.... 조선족 사업가인 박철수를 임명했다. (.... appointed the Joseonjok businessman, Pak Cholsu)
Ethnic languages were repudiated as one of the "four olds" and large numbers of books and documents pertaining to ethnic languages were burned.
{{cite book}}: CS1 maint: location missing publisher (link){{cite web}}: Missing or empty |title= (help){{cite book}}: CS1 maint: location missing publisher (link){{citation}}: CS1 maint: unfit URL (link)Ethnic languages were repudiated as one of the "four olds" and large numbers of books and documents pertaining to ethnic languages were burned.