Andrew Mountbatten-Windsor, the younger brother of King Charles has been served with a summons compelling him to give evidence in a fraud trial in the High Court in December.

The summons was issued this week, with the case set to begin from mid-November and with Mountbatten-Windsor to appear as a witness around the 15 December, which is usually in person, but could also be on video.

There have been many questions in recent years about Mountbatten-Windsor’s personal finances – and challenges about a lack of transparency – and this case promises to give a rare opportunity to hear his own explanations about his financial dealings.

The case will hear allegations made by Nebahat Isbilen, an elderly Turkish woman, who says her former adviser Selman Turk misled her and used her wealth to his own advantage.

Turk has strongly denied dishonesty.

Mountbatten-Windsor will be asked to give evidence related to disputed questions about the handling of Isbilen’s money.

According to court documents, Isbilen claimed she was misled by Turk into paying £750,000 to Mountbatten-Windsor, believing it was for help with a passport.

Turk has denied the allegation and says this payment was a gift made on Isbilen’s own initiative to create goodwill with the then duke and had nothing to do with a passport.

The case covers payments made at the very end of his time as a working royal.

The transfer of money came the day after Mountbatten-Windsor recorded his BBC Newsnight interview, which was then broadcast the following night, and was soon followed by the then Duke of York stepping down from royal duties.

In 2021, Isbilen’s lawyers contacted the then Prince Andrew and the money had been paid back, but the forthcoming court case will consider claims about Turk’s behaviour, with Mountbatten-Windsor set to be a significant witness.

A spokesperson for Police Scotland recently confirmed that they are conducting “active inquiries” following reports involving Andrew and Jeffrey Epstein at Balmoral Castle, the royal family’s private retreat in the Scottish Highlands.

In August, the former Duke of York provided a witness statement in the trial against his alleged stalker after accusing a reportedly homeless man, Alex Jenkinson, of accosting him outside his Sandringham residence in May while he was walking his dogs.