The Canegrate culture (13th century BC) may represent the first migratory wave of the proto-Celtic population from the northwest part of the Alps that, through the Alpine passes, penetrated and settled in the western Po valley between Lake Maggiore and Lake Como (Scamozzina culture). They brought a new funerary practice—cremation—which supplanted inhumation. It has also been proposed that a more ancient proto-Celtic presence can be traced back to the beginning of the Middle Bronze Age (16th-15th century BC), when North Western Italy appears closely linked regarding the production of bronze artifacts, including ornaments, to the western groups of the Tumulus culture (Central Europe, 1600 BC - 1200 BC). The bearers of the Canegrate culture maintained its homogeneity for only a century, after which it melded with the Ligurian aboriginal populations and with this union gave rise to a new phase called the Golasecca culture, which is nowadays identified with the Celtic Lepontii. Livy (v. 34) has the Bituriges, Arverni, Senones, Aedui, Ambarri, Carnutes, and Aulerci led by Bellovesus, arrive in northern Italy during the reign of Tarquinius Priscus (7th-6th century BC), occupying the area between Milan and Cremona. Milan ("Mediolanum") itself is presumably a Gaulish foundation of the early 6th century BC, its name having a Celtic etymology of "[city] in the middle of the [Padanic] plain". Polybius in the 2nd century BC wrote about co-existence of the Celts in northern Italy with Etruscan nations in the period before the Sack of Rome in 390 BC.