Meaning of Fifth Monarchy Men

Fifth' Mon'archy Men"

Pronunciation: [key]
— Eng. Hist. Eng. Hist.
  1. (during the Commonwealth in the 17th century) a militant sect of Puritans who identified the fifth monarchy with the millennial reign of Christ and who believed they should help to inaugurate that reign by force.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.