Claim: Kungshatt,  a small island in Lake Mälaren, Stockholm, Sweden,  is named after the copper hat put in place on top of a cliff facing Vårberg, which is according to a legend, a Swedish king jumped off the cliff while fleeing from his enemies, dropping his hat in the process.
Evidence: The island is named after the copper hat put in place on top of a cliff facing towards VÃ¥rberg. According to legend, a Swedish king jumped off the cliff while fleeing from his enemies, dropping his hat in the process.