Augustine of Hippo — as excerpted in the Catena Aurea on Luke 8:26-39

“(Cons. Ev. ut sup.) Whereas Matthew says, that there were two possessed, but Mark and Luke mention only one; you must understand one of them to be a more distinguished and famous person, for whom that neighbourhood was chiefly distressed, and in whose restoration they were greatly interested. Wishing to signify this, the two Evangelists thought right to mention him alone, concerning whom the report of this miracle had been most extensively noised abroad.”