The legal team representing former Goldman Sachs banker Selman Turk has filed a witness summons seeking to force Andrew Mountbatten-Windsor to provide testimony in a civil fraud trial at the High Court.Janes Solicitors, acting for Turk, confirmed that it had submitted the application “to compel Mr Mountbatten-Windsor to give evidence at the forthcoming trial.”Mr Justice Adam Johnson is understood to have indicated this week that he would deliver his ruling on the matter shortly.Turk’s defence team believes the King’s 66-year-old brother “will be able to provide important evidence” that supports their client’s case.The legal team representing former Goldman Sachs banker Selman Turk has filed a witness summons seeking to force Andrew Mountbatten-Windsor to provide testimony in a civil fraud trial at the High Court. | GETTYThe fraud claim was brought by Turkish millionaire Nebahat Evyap Isbilen, who accuses Turk of misappropriating roughly £40 million of her wealth — an allegation the former banker denies.The firm said it could not elaborate on the proposed evidence while the application remained under judicial consideration.Isbilen, now 81, has alleged that she tasked Turk with moving approximately $90 million in assets out of Turkey to prevent their seizure, but claims he channelled around £40 million of that wealth into offshore structures and entities he controlled.Turk has rejected all accusations of wrongdoing, maintaining that every transfer was properly authorised and that he has fully accounted for his client’s assets.Among the specific financial links cited in the case is a £750,000 payment from Isbilen’s account directly to Mountbatten-Windsor. | GETTYThe legal proceedings were initiated more than five years ago, and Isbilen’s representatives are understood to be opposing the witness summons on the basis that it was filed too late in the process.Disclosures obtained during the case are said to indicate that significant sums belonging to Isbilen were directed towards Mr Mountbatten-Windsor’s household, establishing his connection to the dispute.The forthcoming trial is expected to run for 11 weeks, though the schedule has not yet been finalised.Among the specific financial links cited in the case is a £750,000 payment from Isbilen’s account directly to Mountbatten-Windsor.Turk has also asserted in court filings that a sizeable loan was extended to the former Duke of York via a third-party company in connection with what his lawyers described as “a Swiss ski chalet.”His legal representatives stressed that “crucially, our client maintains that both these payments were made in accordance with Mrs Isbilen’s express instructions.”The two sides offer starkly different accounts of the nature of these transactions. Isbilen’s lawyers are understood to have argued that Turk characterised the £750,000 as a “gift” to Mr Mountbatten-Windsor, intended to secure his assistance with difficulties she was experiencing regarding her Turkish passport.Turk’s position, by contrast, is that the elderly businesswoman knowingly directed the funds herself.Turk was sentenced to 12 months’ imprisonment in 2024 after being held in contempt of court for hiding payments, including funds directed to Sarah Ferguson, Mr Mountbatten-Windsor’s former wife.The presiding judge, Mr Justice Mann, determined that Turk had concealed a £212,676.56 payment to the duchess and had produced a “false invoice by way of explanation.”Mann observed at the time that “there is no doubt that there was some sort of relationship” between Turk and the Yorks.Court proceedings also revealed that Ms Ferguson had sent Turk a written invitation for him and his wife to dine at Royal Lodge.A preliminary timetable for the upcoming trial has pencilled in four potential dates for Mr Mountbatten-Windsor’s testimony: 10 and 14 December, with 17 and 21 December as alternatives should the schedule slip.Turk’s lawyers noted, however, that the timetable was still being revised and remained unagreed.