The earliest archaeological finds in Denmark date back to the Eem interglacial period from 130,000 to 110,000 BC.[24] Denmark has been inhabited since around 12,500 BC and agriculture has been evident since 3900 BC.[25] The Nordic Bronze Age (1800–600 BC) in Denmark was marked by burial mounds, which left an abundance of findings including lurs and the Sun Chariot. During the Pre-Roman Iron Age (500 BC – AD 1), native groups began migrating south, and the first tribal Danes came to the country between the Pre-Roman and the Germanic Iron Age,[26] in the Roman Iron Age (AD 1–400).[25] The Roman provinces maintained trade routes and relations with native tribes in Denmark, and Roman coins have been found in Denmark. Evidence of strong Celtic cultural influence dates from this period in Denmark and much of North-West Europe and is among other things reflected in the finding of the Gundestrup cauldron. The tribal Danes came from the east Danish islands (Zealand) and Scania, today Skåne in Southern Sweden, and spoke an early form of North Germanic. Historians believe that before their arrival, most of Jutland and the nearest islands were settled by tribal Jutes. Many Jutes migrated to Great Britain, according to legend some as mercenaries of Brythonic King Vortigern, and formed the south-eastern territories of Kent, the Isle of Wight and other areas, where they settled. They were later absorbed or ethnically cleansed by the invading Angles and Saxons, who formed the Anglo-Saxons. The remaining Jutish population in Jutland assimilated in with the settling Danes. A short note about the Dani in Getica by the historian Jordanes is believed to be an early mention of the Danes, one of the ethnic groups from whom modern Danes are descended.[27][28] The Danevirke defence structures were built in phases from the 3rd century forward and the sheer size of the construction efforts in AD 737 are attributed to the emergence of a Danish king.[29] A new runic alphabet was first used around the same time and Ribe, the oldest town of Denmark, was founded about AD 700. Viking and Middle Ages Main articles: Viking Age and Kalmar Union The Ladby ship, the largest ship burial found in Denmark From the 8th to the 10th century the population of the wider Scandinavian region was called Vikings by non-Scandinavians. While they mostly lived of agriculture, fishing and trade, they were excellent sailors and would travel as far as Iceland, Greenland and Canada. They traded in all parts of Europe, down to Constantinople and beyond, but would also raid local settlements and set up colonies in far-flung places. The Danish Vikings were most actively raiding the eastern and southern British Isles and Western Europe. They settled in parts of England (known as the Danelaw) under King Sweyn Forkbeard in 1013, and in France where Danes and Norwegians were allowed to settle in what would become Normandy in exchange of allegiance to Robert I of France with Rollo as first ruler.[30] Some Anglo-Saxon pence of this period have been found in Denmark.[31] Denmark was largely consolidated by the late 8th century and its rulers are consistently referred to in Frankish sources as kings (reges). Under the reign of Gudfred in 804 the Danish kingdom may have included all the lands of Jutland, Scania and the Danish islands, excluding Bornholm.[32] Larger of the two Jelling stones, raised by Harald Bluetooth The extant Danish monarchy traces its roots back to Gorm the Old, who established his reign in the early 10th century.[2] As attested by the Jelling stones, the Danes were Christianised around 965 by Harald Bluetooth, the son of Gorm and Thyra. It is believed that Denmark became Christian for political reasons so as not to get invaded by the Holy Roman Empire. A rising Christian power in Europe, the Holy Roman Empire was an important trading partner for the Danes. As a deterrent against this threat, Harald built six fortresses around Denmark called Trelleborg and built a further Danevirke. In the early 11th century, Canute the Great won and united Denmark, England, and Norway for almost 30 years with a Scandinavian army.[31][33] Throughout the High and Late Middle Ages, Denmark also included Skåneland (the areas of Scania, Halland, and Blekinge in present-day southern Sweden) and Danish kings ruled Danish Estonia, as well as the duchies of Schleswig and Holstein. Most of the latter two now form the state of Schleswig-Holstein in northern Germany. In 1397, Denmark entered into a personal union known as the Kalmar Union with Norway and Sweden, united under Queen Margaret I.[34][35][36] The three countries were to be treated as equals in the union. However, even from the start, Margaret may not have been so idealistic; treating Denmark as the clear "senior" partner of the union.[37][38] Thus, much of the next 125 years of Scandinavian history revolves around this union, with Sweden breaking off and being re-conquered repeatedly. The issue was for practical purposes resolved on 17 June 1523, as Swedish King Gustav Vasa conquered the city of Stockholm. The Protestant Reformation spread to Scandinavia in the 1530s, and following the Count's Feud civil war, Denmark converted to Lutheranism in 1536. Later that year, Denmark entered into a union with Norway. 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