Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
So called from the olive trees with which its sides are clothed, is a mountain ridge on the east of Jerusalem (1 Ki. 11:7; Ezek. 11:23; Zech. 14:4), from which it is separated by the valley of Kidron. It is first mentioned in connection with David's flight from Jerusalem through the rebellion of Absalom (2 Sam. 15:30), and is only once again mentioned in the Old Testament, in Zech. 14:4. It is, however, frequently alluded to (1 Ki. 11:7; 2 Ki. 23:13; Neh. 8:15; Ezek. 11:23).
It is frequently mentioned in the New Testament (Mt. 21:1, 26:30, etc.). It now bears the name of Jebel et-Tur, i.e., "Mount of the Summit;" also sometimes called Jebel ez-Zeitun, i.e., "Mount of Olives." It is about 200 feet above the level of the city. The road from Jerusalem to Bethany runs as of old over this mount. It was on this mount that Jesus stood when he wept over Jerusalem. "No name in Scripture," says Dr. Porter, "calls up associations at once so sacred and so pleasing as that of Olivet. The 'mount' is so intimately connected with the private, the devotional life of the Saviour, that we read of it and look at it with feelings of deepest interest and affection. Here he often sat with his disciples, telling them of wondrous events yet to come, of the destruction of the Holy City; of the sufferings, the persecution, and the final triumph of his followers (Mt. 24). Here he gave them the beautiful parables of the ten virgins and the five talents (Mt. 25); here he was wont to retire on each evening for meditation, and prayer, and rest of body, when weary and harassed by the labours and trials of the day (Lk. 21:37); and here he came on the night of his betrayal to utter that wonderful prayer, 'O my Father, if it be possible, let this cup pass from me: nevertheless not as I will, but as thou wilt' (Mt. 26:39). And when the cup of God's wrath had been drunk, and death and the grave conquered, he led his disciples out again over Olivet as far as to Bethany, and after a parting blessing ascended to heaven (Lk. 24:50, 51; Acts 1:12)."
This mount, or rather mountain range, has four summits or peaks: