Royal fans remember the 2017 Invictus Games in Toronto (opens in new tab) as an important milestone in Prince Harry and Meghan Markle's relationship (opens in new tab) This was the first time the two appeared together in public and and was a major confirmation of how serious their relationship is.

Harry and Meghan appeared to be deeply in love at the event (opens in new tab), which makes sense given the secret they were keeping: they were already engaged. This discovery is just one of many facts about the Sussexes published in the new book Finding Freedom: Harry and Meghan and the Making of a Modern Royal Family (opens in new tab).

In retrospect, Meghan gave fans and royal watchers a big hint of the truth. The now iconic white button-down shirt (open in new tab) she wore for her date is known as the "Husband Shirt" from the collection of Meghan's designer friend Misha Nonoo.

They announced their engagement a few months later in November 2017. At their official engagement press conference, Harry kept the truth of their engagement a secret, saying, "It happened a few weeks ago, earlier this month, here at our cottage." He insisted, "We are very happy to be here." It was a very normal, typical night for us."