Bede the Venerable — as excerpted in the Catena Aurea on Mark 14:32-42

“(ubi sup.) The place Gethsemane, in which the Lord prayed, is shewn up to this day at the foot of the Mount of Olives. The meaning of Gethsemane is, the valley of the fat, or of fatness. Now when our Lord prays on a mountain, He teaches us that we should when we pray ask for lofty things; but by praying in the valley of fatness, He implies that in our prayer humility and the fatness of interior love must be kept. He also by the valley of humility and the fatness of charity underwent death for us.”