request vs rogation

request

noun
  • A formal message requesting something. 

  • A message sent over a network to a server. 

  • Act of requesting (with the adposition at in the presence of possessives, and on in their absence). 

  • Condition of being sought after. 

verb
  • To ask (somebody) to do something. 

  • To ask for (something). 

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