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It celebrates Gustav Vasa's election as King of Sweden on 6 June 1523 and the adoption of a new constitution on the same date in 1809.
When: Mar/Apr For many Swedes, Easter's greatest significance is getting a four-day weekend, well timed to polish up the boat, shake the cobwebs off the summer cottage or tidy up the garden.
Most early swimmers used the breaststroke, or a form of it.
Based on a stroke used by native South Americans, the first version of the crawl featured a scissor kick.
Swimming has featured on the programme of all editions of the Games since 1896.
The very first Olympic events were freestyle (crawl) or breaststroke. In the 1940s, breaststrokers discovered that they could go faster by bringing both arms forward over their heads.