[Wearever]

It is confusing, Edward V was never crowned King, Richard captured him on his way to his coronation. Then Titulus Regius was invoked by Richard, then it was revoked by Henry Vll. Henry Vlll then named his son Edward the Vl. So Edward the V is King Edward V. Posthumously. He was Prince in the tower and became King years later when it was an advantage to Henry Vll to do so.

It's true they change the rules and make up titles as they go along. Everyone goes along with the sitting King.