The Kirkburn Sword. Iron Age, 300-200 BC. From a burial at Kirkburn, East Yorkshire, England. Proabably the finest Iron Age sword in Europe. At this time in the Iron Age (300-200 BC) few people were buried in graves when they died. However, East Yorkshire was an exception and this sword was found in a grave excavated by British Museum archaeologists in 1987. The sword was found in Grave 3. It was buried with a man who was in his late 20s or early 30s when he died. The British Museum.