 In a decision of 6 April 1987, rules are defined on how to fly the royal flag at the Royal Palace of Stockholm.Under King Carl XVI Gustaf, king since 1973, the plain triple-tailed flag has flown at the Royal Palace only once.This occurred on 2-3 July 1988, when the King went on a private visit to Wuppertal, Germany; at the same time, the Duke of Halland, his uncle and the only person in the line of succession, was on a private visit to Sainte-Maxime, France.