matins vs rogation

matins

noun
  • Morning prayers. 

  • Together with lauds, the earliest of the canonical hours; traditionally prayed at sunrise or earlier. 

rogation

noun
  • A deeply serious and somber prayer or entreaty. 

  • The demand, by the consuls or tribunes, of a law to be passed by the people; a proposed law or decree. 

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