Read more about him in The Colour of Time: tinyurl.com/y58gmwzc
As he was known to do every Sunday for many years, the emperor went to the Mikhailovsky Manège for the military roll call.
"After a moment's hesitation I threw the bomb. I sent it under the horses' hooves in the supposition that it would blow up under the carriage...The explosion knocked me into the fence."
The dying emperor was given Communion and Last Rites. When the attending physician, Sergey Botkin, was asked how long it would be, he replied, "Up to fifteen minutes."