The retired King of the Belgians has been ordered to take a DNA paternity test by a Brussels court, raising the prospect of finally resolving whether he is the real father of Delphine Boël, a 50-year-old aristocrat artist.

King Albert II, who has refused to recognise Ms Boël as his daughter for more than a decade, must submit to the test within three months or be legally presumed to be the multi-media artist’s father.

An earlier court-ordered DNA test proved that Jacques Boël, scion of one of Belgium's richest industrial dynasties, was not her biological father. Since that 2013 test, Ms Boël, who has two children, has tried to prove that Albert is her father.

The former monarch, 83, abdicated in 2013 in favour of his son Philippe after 20 years on the throne. The decision also cost him his immunity to court judgments such as the paternity test, which would be a saliva test carried out on Albert, Ms Boël and her mother at a Brussels hospital.

Ms Boël's lawyers said in their statement that they were pleased with the "strong affirmation of the principle of acting in the interests of the child" as she seeks legal confirmation of her true identity.