It is one of six annual CCI**** events in the world (the highest level of competition), in addition to the Burghley Horse Trials and Badminton Horse Trials, held in Great Britain, the Rolex Kentucky Three Day Event held in the United States, the Australian International Three Day Event held in Australia, and the Luhmühlen Horse Trials in Germany.
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http://en.wikipedia.org/wiki/Stars_of_Pau