Mold vs Principality

Mold

name

  • A town in and the county town of Flintshire, Wales (OS grid ref SJ2364). 

  • An unincorporated community in Douglas County, Washington, United States. 

  • A surname. 

Principality

name

  • Wales 

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