The 85-year-old ex-monarch was being sued by Corinna zu Sayn-Wittgenstein-Sayn, who alleged Juan Carlos orchestrated threats, surveillance, and intimidation from 2012.

Juan Carlos “emphatically denies ever having harassed” Sayn-Wittgenstein, the former monarch’s lawyer Adam Wolanski told London’s High Court at a hearing in July.

The former monarch asked the court to throw out Sayn-Wittgenstein’s case, arguing that there was no viable claim against him for harassment.

Judge Rowena Collins Rice ruled in his favour today, saying that Sayn-Wittgenstein’s lawsuit did not contain reasonable grounds for bringing the claim.

“No sufficient basis is provided for understanding the evidence that might be expected at trial to provide a real prospect of the claimant succeeding on this claim,” she said.

Sayn-Wittgenstein said in a statement that she was “deeply disappointed” with the decision and was considering all options.

Juan Carlos’ British lawyers did not immediately respond to a request for comment.