The Equites ( nom. singular; sometimes called "knights" in modern times because of the involvement of horses) constituted the lower of the two aristocratic classes of ancient Rome, ranking below the patricians (patricii), a hereditary caste that monopolized political power during the regal era (753 to 509 BC) and during the early Republic (to 338 BC). A member of the equestrian order was known as an eques (plural: equites).