entreaty vs rogation

entreaty

noun
  • The act of entreating or beseeching; a strong petition; pressing solicitation; begging. 

rogation

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

  • A deeply serious and somber prayer or entreaty. 

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