This was a day we knew would come, but which somehow remained inconceivable. The Queen, the only monarch most of us have ever known, has died at 96. 

Today, we will hear from some of the many tributes from around the world, as we enter a period of historic mourning for our monarch. And speak with the Royal Historian Ed Owens about this moment in our history, what we can learn from the past as we enter a completely new present without a Queen whose reign was historic in so many ways.

Sources: AP Archive