pleading vs rogation

pleading

noun
  • The act of making a plea. 

  • A document filed in a lawsuit, particularly a document initiating litigation or responding to the initiation of litigation. 

adj
  • That pleads. 

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 pleading and rogation occurred in a corpus of books? (source: Google Ngram Viewer )