I am not sure of its origin but from various sites on the web I believe it is from an association of the Knights Templar.  All Knights Templar are members of the world's oldest fraternal organization known as Free And Accepted Masons. However, not all Masons are Templars. Templary is but a part of the Masonic structure known as the "York Rite Of Freemasonry"

An Internet Search engine check on "Commandery" will give the reader more general information but more specific information would be welcome.