Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
"The terebinth of Mamre, or its lineal successor, remained from the days of Abraham till the fourth century of the Christian era, and on its site Constantine erected a Christian church, the ruins of which still remain."
This tree "is seldom seen in clumps or groves, never in forests, but stands isolated and weird-like in some bare ravine or on a hill-side where nothing else towers above the low brushwood" (Tristram).