Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 13:1-2

“For, since the Lord had spoken much concerning the destruction of Jerusalem, His disciples wondered, that such numerous and beautiful buildings were to be destroyed; and this is the reason why they point out the beauty of the temple, and He answers not only that they were to be destroyed, but also that one stone should not be left upon another: wherefore it goes on: And Jesus answering said unto him, Seest thou these great buildings? there shall not be left one stone upon another, that shall not be thrown down. Now some may endeavour to prove that Christ’s words were false, by saying that many ruins were left, but this is not at all the point; for though some ruins had been left, still at the consummation of all things one stone shall not be left upon another. Besides it is related, that Ælius Adrian overturned the city and the temple from the foundation, so that the word of the Lord here spoken was fulfilled.”