Boling vs Dingzhou

Boling

name
  • A former region of early imperial China in present-day Hebei. 

  • A former commandery of medieval China in present-day Hebei. 

  • The various seats of the commandery: present-day Raoyang, Anping, and Dingzhou in Hebei. 

  • A surname. 

  • A former princely title of imperial China. 

Dingzhou

name
  • A county-level city in Baoding Prefecture, Hebei, China. 

  • Synonym of Ding Prefecture, a prefecture of imperial China with its seat at Dingzhou. 

How often have the words Boling and Dingzhou occurred in a corpus of books? (source: Google Ngram Viewer )