question: What nationality is Xiahou Ba's father?
context: Title: Xiahou Ba
  Passage: Xiahou Ba (died 255-259), courtesy name Zhongquan, was a military general of the state of Cao Wei in the Three Kingdoms period of China. He was the second son of Xiahou Yuan, a prominent general who served under Cao Cao, the warlord who laid the foundation for the state of Cao Wei. Around 249, Xiahou Ba defected to Wei's rival state, Shu Han, after the regent Sima Yi seized power in a coup d'état. He was killed in battle sometime between 255 and 259 against Wei forces.
  Title: Xiahou Yuan
  Passage: Xiahou Yuan  (died 219), courtesy name Miaocai, was a military general serving under the warlord Cao Cao in the late Eastern Han dynasty of China. He is known for his exploits in western China (in parts of present-day Gansu, Ningxia and Shaanxi provinces) in the 210s, during which he defeated Cao Cao's rivals Ma Chao and Han Sui in Liang Province and the surrounding areas, and forced several Di and Qiang tribal peoples into submission. He was killed in action at the Battle of Mount Dingjun while defending Hanzhong Commandery from attacks by a rival warlord Liu Bei. Xiahou Yuan's death was highly dramatised in the 14th-century historical novel "Romance of the Three Kingdoms", in which he was slain by Liu Bei's general Huang Zhong during a surprise raid.
answer: Eastern Han Dynasty
citations: Xiahou Yuan Xiahou Ba