Despite the impression gained from such films as Ben Hur, there is little evidence that slaves were often used in the Roman galleys. It was believed that, on board military ships at least, only free men could be entrusted with such work. Slaves were sometimes recruited in times of emergency, but they would usually be promised their freedom. Chained galley slaves were, however, common in some other cultures, particularly the Ottoman Empire.
The word gladiator comes from gladius; a term for a short sword. Gladiators were professional armed fighters, engaging other gladiators, animals and condemned criminals in order to entertain audiences. Most were slaves or convicts; but some people also volunteeered to be gladiators in order to gain fame or money or to pay off debts, although they had a legal and social status equivalent to that of slaves, were subject to infamia, and had to swear "to endure to be burned, to be bound, to be beaten, and to be killed by the sword." by their trainers, the lanistae. Volunteers required permission from a magistate to enter a gladiator school (ludus). Gladiators who survived three to five years of combat were freed, and successful ones might earn large amounts of money, since they were paid every time they fought. Gladiatorial combats originated as funeral games, in which slaves fought to the death in order to appease the spirit of the deceased. Female gladiators were occasionally known, but were prohibited by Septimius Severus in 200 A. D. Gladiators were trained in special schools owned by members of the Roman elite, and later by the emperors. Training was probably as rigid and thorough as any in the Roman army. The most important gladiator school was known as the Ludus Magnus. Discipline in the schools was very strict, but the gladiators were well cared for and fed due to their high value. There was a hierarchy of grades among gladiators; the highest grade was primus palus.
Gladiators specialized with particular weapons and armour. One type of Gladiator was the "Thracian", wearing a visored or open-faced helmet and boiled leather greaves (ocrea), and carrying a curved sword with a notch in it and a small square shield. Another type was the Secutor, who fought virtually naked, with a large rectangular or oval shield, leather bands, a round or high visored helmet, and sword or dagger. The "Samnite" gladiator was equipped like the earlier Samnite warriors who fought against Rome in the late fourth and early third centuries B. C., with a visored helmet (galea), an ocrea, and a gladius. The retiarius symbolized a fisherman and carried a net (iaculum), trident and dagger, and wore only a loincloth and metal shoulder-piece. The Laquearius was similar to the Retiarius, but carried a lasso instead of a net.
Early gladiatorial fights usually ended in the death of one of the contestants; but in later times this became less common. Due to the high price of gladiators, it was considered a horrible disaster to lose one to death or injury. There is only one occasion on which the famous saluation "Morituri te salutant" (those about to die salute you) is recorded to have been used; in 52 A. D, by condemned prisoners about to take part in a mock naval battle on Lake Fucinus. A defeated gladiator might appeal for mercy by raising his left hand with one finger extended, and the magistrate presiding over the games would decide whether the gladiator lived or died; there is little evidence for the "thumbs up" and "thumbs down" signs indicating life or death. Dead gladiators were removed by costumed attendants dressed as the ferryman Charon and the god Mercury.
Gladiatorial games were extremely popular; and successful gladiators attracted great prestige, though they were also regarded as social outcasts. Even emperors-including Caligula, Titus, Hadrian, Lucius Verus, Commodus, Didius Julianus, Caracalla, and Geta- competed in the games, although this was disapproved of by the Roman elite.
The last known combat between human gladiators was in 404 A. D. in the reign of the emperor Honorius. The action of the Christian monk St. Telemachus in trying to prevent a gladitorial fight, and being stoned to death by the audience, may have contributed to the demise of the sport; Gibbon described the saint as "the only monk who died a martyr in the cause of humanity". Combats with animals, however, continued into the sixth century; after Rome had been occupied by the Ostrogoths.
At the time when the book was written (the 1960s), nearly all people in the Western "world" thought of themselves as "Christian"- although many, like Karen, "gave little thought" to it.
The Great Fire of Rome in 64 A. D. began in the Circus Maximus. It swept violently over the level spaces and climbed the hills. Women, old and young people fled from the flames. Some preferred to die because they had lost their possessions or loved ones. Nobody fought the flames, but some threw torches in, claiming that they had acted under orders.
Nero was at Antium, returning to the city only when his palace was threatened- although it was completely destroyed. He threw open the Field of Mars for the relief of the homeless, and brought in grain from surrounding towns at low prices. Some claimed that he had deliberately started the fire in order to build a new palace for himself.
By the sixth day the fire had been stamped out at the foot of the Esquiline Hill, but another broke out in the more open districts of the city, starting on Tigellinus' estate in the Esquiline district.
Of Rome's Fourteen districts, only four remained intact, and three were completely destroyed.
Read more about Early Christians and the Burning of Rome from Michael Streich