I'll be blogging on history this week (just a warning) so, try to stay awake while reading this. There are a lot of different history eras of Italy however, I'll be mainly focusing on the Roman era.
Italy is obviously the birth place of the Roman Empire. Julius Caeser placed a big part in Italy's history. According to legend, Rome was founded in 753 BC by Romulus and Remus, and was then governed by seven Kings of Rome. In the following centuries, Rome started expanding its territory, defeating its neighbours one after the other. Greeks settled in the southern tip of the Italian Peninsula in the eighth and seventh centuries B.C. Etruscans, Romans, and others took over the central and northern mainland. The neighbouring islands also came under Roman control by the third century B.C. By the first century A.D., the Roman Empire effectively dominated the Mediterranean world. After the collapse of the Roman Empire in the West in the fifth century A.D., the peninsula and islands were subjected to a series of invasions, and political unity was lost. Italy became an oft-changing succession of small states, principalities, and kingdoms, which fought among themselves and were subject to ambitions of foreign powers. Popes of Rome ruled central Italy; rivalries between the popes and the Holy Roman Emperors, who claimed Italy as their domain, often made the peninsula a battleground.
http://www.infoplease.com/ipa/A0107658.html
http://www.lonelyplanet.com/italy/history