Princess Lilian and Prince Bertil finally married in 1976, following a relationship of more than thirty years.
Bertil's father, King Gustaf VI Adolf, had ordered him to abstain from marrying commoner Lilian.
The couple were finally give royal approval to marry by King Carl XVI Gustaf, who took the throne in 1976.
More top news
Today will start mostly dry with sunny spells. Turning cloudier with persistent rain spreading from the south later.
Tonight will remain mostly dry apart from the odd shower in places.
The mother of missing 19-year-old James Corfield from Montgomery read an emotional statement at the Royal Welsh showground this afternoon.