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In page Lidingö Municipality:

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Lidingö traces its history to at least 600 BC, from when remains have been found.[1] According to legend, Lidingö was a place where the Vikings would gather before setting sails to eastern areas, however no proof have been found to confirm that theory. When the city arms was to be chosen in 1928 a Viking ship became the motif, in the colors of the Swedish flag. Lidingö was first mentioned in writing in 1328, called Lydhingö when the entire island and the farms were owned by Bo Johnsson Grip. On a map from 1661 the island is called Lijdingeöö.[citation needed]