Londinium vs Old Dart

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. 

Old Dart

name
  • Britain, England, London, or Ireland; the Old Country. 

  • Dartmouth Royal Navy College. 

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