After François Ravillac assassinated Henry IV of France in 1610, it was discovered that

HENRICUS IV GALLIARUM REX (“Henry IV, King of the Gauls”)

can be rearranged to spell

IN HERUM EXURGIS RAVILLAC (“From these Ravillac rises up”)

His predecessor, Henry III, was also assassinated–his killer’s name, Frère Jacques Clement, can be anagrammed to spell C’est l’enfer qui m’a créé — “hell created me.”