Corsica and killings culminated in the assassination of Prefect Claude Érignac in 1998. In 2013, Corsica hosted the first three stages of the 100th Tour de France, which passed through the island for the first time in the event's 110-year history. Corsica was formed about 250 million years ago with the uplift of a granite backbone on the western side. About 50 million years ago sedimentary rock was pressed against this granite, forming the schists of the eastern side. It is the most mountainous island in the Mediterranean, a "mountain in the sea". It is also the fourth largest island in
Ancient Corsica also interested in Corsica even at this early stage. A first attempt to found a Roman colony on the island in 425 BC was a failure. In 296 BC, the island was used by the Romans as a place of exile for Galerius Torquatus. The Roman conquest of Corsica began in 259 BC, when Lucius Cornelius Scipio captured Aleria (Greek 'Alalia') and several Corsican tribes, in the course of the First Punic War. The Roman invasion of the island marked the expansion of the war beyond Sicily to the entire western Mediterranean. In the subsequent peace treaty in 241 BC