This article originally appeared on Who.
Prince Harry and Meghan Markle will wed in May 2018, within six months of announcing their engagement this week.
When it comes to royal weddings that is a relatively short turn around time. So why that date?
According to royal expert Kate Nicholl it's because of Harry's relationship with his elderly grandfather, Prince Philip.
“He didn't want to have such a big royal wedding at Westminster Abbey -- it doesn't need to be as big as William's wedding. Harry really wanted to have something a little bit more intimate," Nicholl told ET. "The second reason is that he wanted something close to home for the Duke of Edinburgh and the Queen.”
“In fact, one of the reasons that Prince Harry has wanted this wedding to happen quite quickly -- this is really whirlwind by royal standards -- is because his 96-year-old grandfather, the Duke of Edinburgh, is retired now and Prince Harry really wants him to be at his wedding,” Nicholl continued.
“He's incredibly close to his grandfather and, being 96, Harry thought it was it was a great thing to [have] the wedding sooner rather than later, so his grandfather could be there, fit and healthy.”