As they came out; i.e. from the city gate which led to the place of execution. They found a man of Cyrene, Simon by name. He was, as the other synoptists mention, coming out of the country to Jerusalem, where probably he lived.
Cyrene was a district in the north of Africa, under Roman rule, and colonized by a large number of Jews (Josephus, 'Cont. Apion.,' 2.4; 'Ant.,' 14.7. 2), who had a synagogue of their own at Jerusalem (Acts 6:9).
Simon doubtless became a follower of Christ, and St. Mark mentions his two sons, Alexander and Rufus, as well known believers (see Romans 16:13). Probably the guards saw in him some tokens of sympathy with Christ and compassion for his sufferings; or they used his services simply as being a foreigner, and not likely to resent being put to a task which a Hebrew would deem the lowest degradation.
Him they compelled ( ἠγγα ìρευσαν, impressed) to bear his cross. The verb translated "compelled" is derived from the Persian, and implies the compulsory power possessed by couriers of requisitioning horses and carriages in forwarding despatches (see Matthew 5:41).
The cross was probably the ordinary Latin cross, crux immissa, of which, however, the lower limb below the transom was longer than the upper; and this latter afforded a place where could be affixed the board containing the inscription.
It was not as tall as usually represented; we are told that beasts of prey were able to gnaw the bodies hung thereon. In fact, the culprit's feet were only just raised above the ground, being drawn up till the soles lay flat on the upright beam.
Nails were driven through the hands and feet, and the body was supported partly by these, and partly by a projecting pin of wood called the seat. The rest for the feet, often seen in pictures, was never used.
A slight covering was allowed for decency's sake, the rest of the body being stripped of clothing; and thus the condemned, exposed to scorching sun, bleeding from the cruel scourge, suffering untold agonies, was left to die.
Whether Jesus carried the whole cross or only the transom is uncertain. It is possible that the two were tied together by a rope at one end, so as to form an inverted V, and fastened in the proper position at the place of execution.
However this may he, it proved too heavy a burden for him to bear. Spent with his long vigil and lack of food, his spirit afflicted by the agony in the garden and the unknown sufferings then and afterwards, his body tortured with open wounds and weakened with loss of blood, he sank beneath the weight, as he staggered weariedly along the rough and hilly streets, Either from a momentary compunction, or more probably flora impatience at the slowness of the poor Sufferer's movements, the soldiers gladly seized on Simon to relieve the Prisoner of the cross, or to share its weight, and thus enable them sooner to complete their cruel task.