The capital narrative is identified by an inscribed label in the south face. The top moulding of the impost is decoratively carved, and unusual feature.
Biblical source: Acts 7:58-60.

Inscribed: Tomb of Saint Stephen

East View: Saint Stephen preaching.

South View: The Burial of Saint Stephen
Inscribed: SEPVLCRVM BEATI: STEPHANI

West View: Saint Stephen kneeling (the stoning).

North View: Saint Stephen arrested.

Related capitals:

Martyr Capitals:
Capital 1: John the Baptist Capital 6: Stephen
Capital 20: Peter and Paul
Capital 24: Lawrence
Capital 35: Saturnin (Sernin)
Capital 37: Fructuosis, Eulogius, and Augurius

New Testament Capitals:
Capital 1: Martyrdom fo John the Baptist
Capital 6: Martyrdom fo Stephen
Capital 12: Miracles of Christ
Capital 13: The Good Samaritan
Capital 14: Temptation of Christ
Capital 16: Transfiguration
Capital 17: Deliverance of Peter
Capital 18: Christ's baptism by John
Capital 25: Christ washes the feet of his disciples
Capital 27: Lazarus and the Rich Man
Capital 30: Wedding at Cana
Capital 32: Adoration of the Magi, Massacre of the Innocents
Capital 38: Annunciation and Visitation
Capital 44: Miracles of Peter
Capital 47: Calling the Apostles
Capital 56: Christ and the Samaritan Woman
Capital 61: Annunciation to the Shepherds
Capital 64: Raising of Lazarus
Capital 71: Beatitudes

Acts of the Apostles 7:58-60
58 Then they cast him out of the city and stoned him; and the witnesses laid down their garments at the feet of a young man named Saul.
59 And as they were stoning Stephen, he prayed, "Lord Jesus, receive my spirit."
60 And he knelt down and cried with a loud voice, "Lord, do not hold this sin against them." And when he had said this, he fell asleep.

The New Oxford Annotated Bible with the Apocrypha, Revised Standard Version.

Inscriptions based on Robert Favereau, Jean Michaud, and Bernadette Leplant, Corpus des Inscriptions de la France Medievale. Vol. 8, Ariege, Haute-Garonne, Hautes-Pyrenees, Tarn-et-Garonne. Paris: Centre National de la Recherche Scientifique, 1982.