The identification between tree and monument implied that the site of the martyrdom of Saint Peter was placed either between the "Terebinthus" and the "Meta Romuli", or between the latter and the obelisk of the Circus of Nero (and in some medieval description the monument itself is named "obelisk of Nero"), or in the mid-point between the two pyramids ("ad Terebinthus inter duas metas...in Vaticano") and consequently the "Terebinthus" (either as monument or as tree) was for a long time a popular subject in the depictions of Saint Peter's martyrdom and in the representations of the city in the Middle Ages.