Xianbei-Han identity, renaming his own clan Yuan (元 meaning "elemental" or "origin"). In the year 493 Emperor Xiaowen instituted a new sinification program that had the Xianbei elites conform to many Han standards. These social reforms included donning Han clothing (banning Xianbei clothing at court), learning the Han language (if under the age of thirty), applied one-character Han surnames to Xianbei families, and encouraged the clans of high-ranking Xianbei and Han families to intermarry. Emperor Xiaowen also moved the capital city from Pingcheng to one of China's old imperial sites, Luoyang, which had been the capital during the earlier Eastern Han and Western Jin dynasties. The new capital at Luoyang was revived and transformed, with roughly 150,000 Xianbei and other northern warriors moved from north to south to fill new ranks for the capital by the year 495. Within a couple of decades, the population rose to about half a million residents and was famed for being home to over a thousand Buddhist temples. Defectors from the south, such as Wang Su of the prestigious Langye Wang family, were largely accommodated and felt at home with the establishment of their own Wu quarter in Luoyang (this quarter of the city was home to over three thousand families). They were even served tea (by this time gaining popularity in southern China) at court instead of yogurt drinks commonly found in the north. In the year 523, Prince Dongyang of the Northern Wei was sent to Dunhuang to serve as its governor for a term of fifteen years. With the religious force of Buddhism gaining mainstream acceptance in Chinese society, Prince Dongyang and local wealthy families set out to establish a monumental project in honor of Buddhism, carving and decorating Cave 285 of the Mogao Caves with beautiful statues and murals. This promotion of the arts would continue for centuries at Dunhuang and is now one of China's greatest tourist attractions. The Northern Wei started to arrange for Han elites to marry daughters of the Xianbei Tuoba imperial family in the 480s. More than fifty percent of Tuoba Xianbei princesses of the Northern Wei were married to southern Han men from the imperial families and aristocrats from southern China of the Southern dynasties who defected and moved north to join the Northern Wei. Some Han exiled royalty fled from southern China and defected to the Northern Wei. Several daughters of the Xianbei