The Latin "corolla" means "small crown or garland." The Latin word "corollarium" comes from "corolla" and means "money paid for a garland" or "gratuity." In ancient Rome, a garland or small crown was sometimes given to actors as a reward or bonus in addition to their regular pay. Later, "corollarium" developed the sense of something that follows directly from something that has been proved. English speakers adopted the word as "corollary." Eventually, "corollary" developed the broader meaning of "something that naturally follows or accompanies." You can think of a corollary as a bonus or something additional that results from something else.