of rank had developed among them. There were Chinese
families who regarded themselves as superior to the rest, just as had
been the case among the northern peoples, and who married only among
themselves or with the ruling house and not with ordinary families of
the gentry. They paid great attention to their genealogies, had the
state keep records of them and insisted that the dynastic histories
mentioned their families and their main family members. Lists of
prominent gentry families were set up which mentioned the home of each
clan, so that pretenders could easily be detected. The rules of giving
personal names were changed so that it became possible to identify a
person's genealogical position within the family. At the same time the
contempt of the military underwent modification; the gentry were even
ready to take over high military posts, and also to profit by them.

The new Sui empire found itself faced with many difficulties. During the
three and a half centuries of division, north and south had developed in
different ways. They no longer spoke the same language in everyday life
(we distinguish to this day between a Nanking and Peking "High Chinese",
to say nothing of dialects). The social and economic structures were
very different in the two parts of the country. How could unity be
restored in these things?

Then there was the problem of population. The north-eastern plain had
always been thickly populated; it had early come under Toba rule and had
been able to develop further. The region round the old northern capital
Ch'ang-an, on the other hand, had suffered greatly from the struggles
before the Toba period and had never entirely recovered. Meanwhile, in
the south the population had greatly increased in the region north of
Nanking, while the regions south of the Yangtze and the upper Yangtze
valley were more thinly peopled. The real South, i.e. the modern
provinces of Fukien, Kwangtung and Kwangsi, was still underdeveloped,
mainly because of the malaria there. In the matter of population the
north unquestionably remained prominent.

The founder of the Sui dynasty, known by his reign name of Wen Ti
(589-604), came from the west, close to Ch'ang-an. There he and his
following had their extensive domains. Owing to the scanty population
there and the resulting shortage of agricultural labourers, these
properties were very much less productive than the small properties in
the north-east. This state of things was