Titus of Bostra
Catena Aurea · Lukasevangelium 22
Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve. And he went his way, and communed with the Chief Priests and captains, how he might betray him unto them. And they were glad, and covenanted to give him money. And he promised, and sought opportunity to betray him unto them in the absence of the multitude.
And he adds, one of the twelve, since he made up the number, though he did not truly discharge the Apostolic office. Or the Evangelist adds this, as it were for contrast sake. As if he said, “He was of the first band of those who were especially chosen.”