Crucifixion was first used as a method of punishment about 600 years before Jesus lived, and it was still used until the Roman emperor Constantine banned it in AD 337..
It was a method of execution used by the Romans to punish slaves, foreigners and criminals of the worst sort, such as traitors or deserters from the army. It was considered shameful, as the victims were left to die in public, they were often naked, and sometimes it took days.
Victims of crucifixion had spikes driven through their wrists, attaching them to a cross beam, which was then attached to an upright bar.
The way the body left hanging meant that the victims slowly suffocated. If it was taking too long, they would have their legs broken to speed things up.
Jesus died very quickly – probably because he had been so badly beaten up before he was put on the cross.