Jerusalem (Mount of Olives) - Gethsemane (Church of Agony)

Source: 
Petr. Diac., LS
Abbreviation for Journals and Series
Paragraph: 
I
Translation: 

Also on the Mount of Olives is a splendid cave with an altar in it, where the Lord used to teach his disciples, and over the cave a large holy church. - - - and not far from that is the place where the Lord prayed, when his sweat became like drops of blood <Luke 22:44>.

(transl. Wilkinson)

Bibliografical ref.: 
Bibliography
Wilkinson, J., 1981
Summary: 
Mention of the place of Agony, presumably from a passage lost in the MS of It. Eg., as recorded in a guidebook for pilgrims compiled AD 1137.
Commentary: 

Wilkinson, pp. 185, 326, suggests that "the place was the rock in the present Church of All Nations at the foot of the Mount of Olives".