plea vs rogation

plea

noun
  • An appeal, petition, urgent prayer or entreaty. 

  • That which is alleged or pleaded, in defense or in justification. 

  • The defendant’s answer to the plaintiff’s declaration and demand. 

  • A cause in court; a lawsuit; as, the Court of Common Pleas. 

  • An allegation of fact in a cause, as distinguished from a demurrer. 

  • An excuse; an apology. 

  • That which is alleged by a party in support of his cause. 

verb
  • To plead; to argue. 

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