* Here is an abstract on Dr. Reckel's work for you guys to read directly. Enjoy!
Bohai-Geschichte und Kultur eines mandschurisch-koreanischen Konigreiches der Tang-Zeit, dargestellt nach den Schriftzeugnissen und dem arch?¤ologischen Fundmaterial [in German]. To be published as Aetas Manjurica 5 (Wiesbaden: Harrassowitz, 1995)
Reckel, Johannes, Ph.D. Thesis, University of Guettingen, 1993
Comprehensive archeological study on the Parhae Kingdom by Dr. Johannes Reckel (his Ph.D thesis actually), professor at the University of Guettingen.
Bohai flourished between 698 and 926, when it was overrun by the Mongolian Kitan. It occupied the area of Manchuria, northern Korea and the Russian territories east of the Ussuri and along the Amur. The importance of Bohai lies in the fact that it stands on a major turning point in the history of Northeast Asia and more specifically, Manchuria. Until the middle of the 1st m. AD, Manchuria was dominated by Korean kingdoms like Koguryo and Puyo, and the Sushen, whom the old Chinese historians believed to be the ancestors of the modern Manchu. Around 500 AD, the Wuji, who soon afterwards are called Mohe, poured into the whole of Manchuria, destrouying Puyo and eventually making up a considerable percentage of the population of Korugyo. In 668, Silla destroyed her two rivals, Paekche and Koguryo, with the help of the Chinese army. But neither China nor Silla managed to bring the northern parts of Koguryo under their own rule, and in 698 a new kingdom, soon afterwards called Bohai, emerged from the former Koguryo upper class and the Mohe. Bohai's third king, Da Qinmao (r. 737-93), built five large capitals ( a tradition later carried on by the Kitan and Jurchen) ca. 3400×4600m, after the model of the Chinese capital Chang'an. The ruins of three of these five capitals have been found and (partly) excavated; they belong to the largest cities in Asia of those days.
Unfortunately, all written historical records of Bohai herself have been destroyed. Thus we have to rely on the rather biased Chinese sources and on records the Japanese kept concerning Bohai missions arriving in Japan. Korean sources pass over this unpleasant rival in the north, which claimed to be the rightful heir of Koguryo, altogether in silence. Today it is still a matter of discussion amongst historians if Bohai is a Korean kingdom, a Manchurian-Tungus state or just a Chinese vassal. Bohai definitely had a mixed population. The Koguryo upper class represents the old "Korean" Manchuria, whereas the majority of the rural population-probably even the royal family-was of Tungus-Mohe stock, pointing towards the future Manchuria.
This thesis is not a specialized study on certain aspects of Bohai but tries to establish a basis upon which more detailed research could be carried out in future. Part one (ca. 200 pp.) offers a complete translation [into German] of all Chinese and Korean written sources on the Mohe (from ca. 500 AD onwards) and on Bohai, and it summarises in translation the Japanese Six National Histories (rikkokushi), etc. Part two lists all known archaeological sites of Mohe/Bohai culture in China, Korea and Russia, with longer or shorter descriptions for each site arranged according to areas centred around one of the ancient capitals or major provincial towns. Where possible, certain archaeological sites have been linked to places mentioned in the written sources. 150 pages of figures show the objects found on the archaeological sites in B&W drawings. Part three tries to give a description and analysis of Bohai history and culture on the basis of the material previously presented.
Through the archaeological materials, the picture drawn by the scanty written sources becomes much clearer: three different materials cultures are found in Bohai territory. Firstly, the old Koguryo culture is mainly confined to old Koguryo territory along the Tumen river and its tributaries and the royal burial ground of the first two or three generations near modern Dunhua: represented by tiles with ornamented surfaces, small stepped-pyramid forming underground stone tombs, certain types of Buddhist stone images, and stone-faced town walls, etc. The Chinese Tang culture flourished mainly in and around the Supreme and Central capitals (Shangjing, Zhongjing). It is represented by brick pagodas, brick tombs with murals depicting Tang-style courtiers, the structure of the capitals, and three-coloured glazed ceramics, etc. The picture of the third culture, of the Mohe, is slightly more complicated. The "Leitfossil" of this culture is a small urn-shaped pot with a double rim near its mouth. Together with certain highly ornamented belt-plaques, it is found in nearly all Wuji/Mohe tombs or house ruins from the 5th-10th c. AD. Interestingly enough, we also find it in the burial ground of the first generations of the royal family of Bohai. But thereafter it is absent from the rather sophisticated culture of the new capitals developing since the second half of the 8th c. and is pushed towards the northern fringes of the empire.
This archaeological evidence is confirmed by an analysis of the personal names of Bohai. (Of course, the sources would not record the names of the common people but rather of officials and representatives of the ruling class.) Typical Mohe-names disappear completely after the first two generations, whereas members of the old Koguryo upper class-represented by those bearing the family name Gao (Kor. Ko as short for Koguryo)-continue to play a leading role, especially in the frequent missions to Japan. The Mohe in the southern and central parts of Bohai had become completely sinicised by the time of the downfall of Bohai, whereas the Mohe culture along the lower Sungari and Amur in the 10th c. develops into the Jurchen culture, represented by typical pottery with pumpkin-shaped bellies and high necks. Towards the end of the 11th c. the Jurchen reconquer lost ground and again occupy nearly the whole of Manchuria.
The limits of this thesis do not allow a detailed study of the Mohe culture; however, a comprehensive bibliography on the Mohe and Bohai of nearly a thousand titles invites the reader to further studies.