If one happened to be in a place at a time when a member of a royal family walked by, should one make the Berachah that one says upon seeing a king?
Assume the royal person did, in fact, wield great power, including absolute authority with regard to matters of life and death for those who rank below him.
If so, should one make the Berachah if one did not realize until after the fact that this was a royal person of such rank?