Freemasonry evolved from the guilds of stonemasons and cathedral builders of the Middle Ages. With the decline of cathedral building, some lodges of operative (working) masons began to accept honorary members to bolster their declining membership. (britannica . com) The disbanded Knights Templars made used of this opportunity and turned Masonic lodges into their working fronts. When Freemasonry became a formidable underwater international network in the 1730s, Jesuits introduced Roman Catholic ceremonies into Freemasonry, and have used Freemasonry as their working front ever since.