section_path: History/Metal Ages
section_name: Metal Ages
paragraph_text: Metal Ages
  
  From about 1500 BC, bronze was gradually introduced. Burial cairns built close to the sea as far north as Harstad and also inland in the south are characteristic of this period, with rock carving motifs that differ from those of the Stone Age, depicting ships resembling the Hjortspring boat, while large stone burial monuments known as stone ships were also erected.
  
  There is little archaeological evidence dating to the early Iron Age (the last 500 years BC). The dead were cremated, and their graves contained few goods. During the first four centuries AD, the people of Norway were in contact with Roman-occupied Gaul; about 70 Roman bronze cauldrons, often used as burial urns, have been found. Contact with countries farther south brought a knowledge of runes; the oldest known Norwegian runic inscription dates from the third century.