 Other ancient populations being of undetermined language families and of possible non-Indo-European origin include the Rhaetian people and Cammuni, known for their rock carvings in Valcamonica, the largest collections of prehistoric petroglyphs in the world.A well-preserved natural mummy known as Ötzi the Iceman, determined to be 5,000 years old (between 3400 and 3100 BCE, Copper Age), was discovered in the Similaun glacier of South Tyrol in 1991.The first foreign colonizers were the Phoenicians, who initially established colonies and founded various emporiums on the coasts of Sicily and Sardinia.