He who grants a lease. Lessor of the plaintiff. In the action of ejectment, this was the party who really and in effect prosecuted the action and was interested in its result. The reason of his having been so called arose from the circumstance of the action having been carried on in the name of a nominal plaintiff, (John Doe,) to whom the real plaintiff had granted a fictitious lease, and thus had become his lessor.
LESSOR
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.