St George's Chapel holds between 800 and 1000 people - large enough for a major wedding, but less formal that Westminster Abby where Harry's brother Prince William Wednesday Kate Middleton. or St Paul's Cathedral, where Harry's parents Prince Charles and Diana Spencer were married.
Mr Knauf added that the couple were "grateful to the Queen for granting permission for the use of the Chapel".
A spokesman said the 36-year-old Suits actress would retain United States citizenship through the process of becoming a United Kingdom citizen but it was "too early to say" if she would retain dual nationality.
The last wedding held there was the union of Harry's father and Camilla Parker Bowles in 2005, where they received a blessing from The Archbishop of Canterbury. The exact date was not revealed. She will join Prince William, Kate and Prince Harry's royal foundation as its fourth patron, and work with her husband to support causes close to her heart.
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These sparse details alone confirm their wedding will be stunning-and far more opulent than Prince Harry's proposal, which apparently happened during a cozy night in while he and Markle were roasting a chicken.
Details of the much-anticipated royal wedding of Prince Harry and Meghan Markle have emerged, along with Meghan's plans to become a United Kingdom citizen and convert to the Anglican faith.
Prince Charles and Camilla during their wedding at St George's Chapel.
Kensington Palace also revealed that Harry and Ms Markle will carry out their first official engagement together in Nottingham on Friday. Meghan moved into Prince Harry's home, Nottingham Cottage in Kensington Palace, earlier this month and stayed there whenever she would visit her boyfriend.
Clearly happy in each other's company, the beaming couple recounted how they met on a blind date set up by a mutual friend, and immediately clicked.