Odeum was a building intended for the recitations of rhapsodists and the performances of citharædists, before the theatre was in existence. In its general form and arrangements the odeum was very similar to the theatre. There were, however, some characteristic differences. The odeum was much smaller than the theatre, and it was roofed over. The ancient and original Odeum of Athens in the Agora was probably erected in the time of Hipparchus, who, according to Plato, first introduced at Athens the poems of Homer, and caused rhapsodists to recite them during the Panathenæa. There were two others in Athens--the Odeum of Pericles, and that of Herodes Atticus. The Odeum of Pericles was built in imitation of the tent of Xerxes. It was burnt by Sylla, but was restored in exact imitation of the original building. It lay at the east side of the theatre of Dionysus. The Odeum of Herodes Atticus was built by him in memory of his departed wife Regilla, whose name it commonly bore. It lies under the southwest angle of the Acropolis. Its greatest diameter within the walls was 240 feet, and it is calculated to have held about 8,000 persons. There were odea in several of the towns of Greece, in Corinth, Patræ, and at Smyrna, Ephesus and other places of Asia Minor. There were odea also in Rome; one was built by Domitian, and a second by Trajan. There are ruins of an Odeum in the villa of Adrian, at Tivoli and at Pompeii. Remains of amphitheatres are found in several cities of Etruria. The amphitheatre of Sutri is considered to be peculiarly Etruscan in its mode of construction. It is cut out of the tufa rock, and was no doubt used by that people for festal representations long before Rome attempted anything of the kind. The Romans copied these edifices from the Etruscans. We have historical evidence, also, that gladiatorial combats had an Etruscan origin, and were borrowed by the Romans. Amphitheatres were peculiar to the Romans. The gladiatorial shows, and the chase and combats of wild beasts with which the amphitheatre is always connected, were at first given in the circus. Its unsuitableness for such sports determined Julius Cæsar, in his dictatorship, to construct a wooden theatre in the Campus Martius, built especially for hunting. Caius Scribonius Curio built the first amphitheatre, for the celebration of his father's funeral games. It was composed of two theatres of wood, placed on pivots, so that they could be turned round, spectators and all, and placed face to face, thus forming a double theatre, or amphitheatre, which ending suggested its elliptical shape. Statilius Taurus, the friend of Augustus, B.C. 30, erected a more durable amphitheatre, partly of stone and partly of wood, in the Campus Martius. Others were afterwards built by Caligula and Nero. The amphitheatre of Nero was of wood, and in the Campus Martius.