Khanbaliq or Dadu of Yuan (Chinese: 元大都) was the winter capital of the Yuan dynasty of China in what is now Beijing, also the capital of the People's Republic of China today. It was located at the center of modern Beijing. The Secretariat directly administered the Central Region (腹裏) of the Yuan Empire (comprising present-day Beijing, Hebei, Shandong, Shanxi, and parts of Henan and Inner Mongolia) and dictated policies for the other provinces. Kublai and his successors also claimed supremacy over the entire Mongol Empire following the death of Möngke (Kublai's brother and predecessor) in 1259. Over time the unified empire gradually fragmented into a number of khanates.