What is present-day Luxembourg was inhabited by Celts during the Iron Age (from roughly 600 BC until 100 AD). The Gaulish tribe in what is present-day Luxembourg during and after the La Tène period was known as the Treveri, which reached the height of prosperity in the 1st century BC. They constructed a number of fortified settlements or oppida near the Moselle valley in what is now southern Luxembourg, western Germany and eastern France. Most of the archaeological evidence from this period has been discovered in tombs, many closely associated with Titelberg, a 50 ha site which reveals much about the dwellings and handicrafts of the period.