Treasure linked to the reign of 10th Century Danish King Harald Bluetooth has been dug up in northern Germany.

An amateur archaeologist and a 13-year-old boy found a silver coin on the Baltic island of Rügen in January when scanning a field with metal detectors.

They found braided necklaces, a Thor's hammer, brooches, rings and about 600 coins, probably buried in the 980s.

"This trove is the biggest single discovery of Bluetooth coins in the southern Baltic sea region and is therefore of great significance," said lead archaeologist Michael Schirren.

Harald Bluetooth was born a Viking and is credited with unifying Denmark and introducing Christianity there during his reign.

The king was immortalised by Nordic technology firms when they embedded their wireless "Bluetooth" technology in digital gadgets.

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Germans find 'Harald Bluetooth' medieval treasure (http://www.bbc.com/news/world-europe-43786129)