Kingdom of Great Britain vs Londinium

Kingdom of Great Britain

name
  • The name of the United Kingdom from 1707-1801. 

Londinium

name
  • Synonym of Modern London A city in England, United Kingdom 

  • A city in Britannia, Roman Empire An ancient settlement in the area of modern London. 

How often have the words Kingdom of Great Britain and Londinium occurred in a corpus of books? (source: Google Ngram Viewer )