St John before the Latin Gate
Jesus had promised James and John, sons of Zebedee, that they should drink the chalice of His passion so as to participate in the triumph of His resurrection (Gospel).
The Emperor Domitian caused John to be brought to Rome and condemned him to be plunged into a cauldron of boiling oil.
But St. John, by a striking miracle, came forth from this torment more healthy and vigorous than before. A sanctuary was built on this spot near the Latin gate and dedicated to the holy apostle. There is held the Station on Passion Saturday.
Protexisti me, Deus, a conventu malignantium, alleluja: a multitudine operantium iniquitatem, alleluja, alleluja. * Exaudi, Deus, orationem meam cum deprecor: a timore inimici eripe animam meam.
Thou hast protected me, O God, from the assembly of the malignant, alleluia: from the multitude of the workers of iniquity, alleluia, alleluia. * Hear, O God, my prayer, when I make supplication to Thee: free my soul from the fear of the enemy.
(Psalm 63:3,2 from the Introit of Mass)
Deus, qui conspicis quia nos undique mala nostra perturbant: praesta, quaesumus; ut beati Joannis Apostoli tui et Evangelistae intercessio gloriosa nos protegat.
O God, who seest that on every side we are afflicted by our evils: deny us not, we entreat Thee, the safeguard of the glorious intercession of blessed John Thine apostle and evangelist.
The Catholic Encyclopaedia on St John: http://www.newadvent.org/cathen/08492a.htm