Hail the King

Condition:
When any card functioning as a king, regardless of suit, is played.

Description:
Player must hail a specific historical King based on the suit played, by saying "All hail _____".

Diamonds: Julius Caesar

Hearts: Charlemagne

Clubs: King Alexander

Spades: King David

Failure
"Failure to hail the king." or "Failure to hail the correct king."

Creator
Archbishop

Trivia
A very straightforward rule but hated by people who have poor memory AKA weak people : )