conjugal vs epithalamic

conjugal

adj
  • Of or relating to marriage, or the relationship of spouses; connubial. 

epithalamic

adj
  • Of or pertaining to the epithalamus. 

  • Belonging to, or designed for, an epithalamium. 

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