Fescennine vs fescennine

Fescennine

adj

  • Of or pertaining to the ancient Etruscan town of Fescennia 

  • obscene or scurrilous 

fescennine

adj

  • Obscene or scurrilous. 

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