"last disciple"
Christ on the Cross (1516) with Mary and John to the right
Public DomainChrist on the Cross (1516) with Mary and John to the right - Credit: Hans Holbein the Younger
Calvary or Crucifixion (c. 1500-05)
Public DomainCalvary or Crucifixion (c. 1500-05) - Credit: Josse Lieferinxe

An allusion to John who, alone among the original twelve disciples, remained with Jesus at his crucifixion.