 Henry converted to Catholicism in 1593, and was anointed at Chartres the next year.The proclamation of Charles, Cardinal de Bourbon, as King Charles X, went against the principle of primogeniture, and was therefore void.By the principle of continuity of the crown, the reign of Henry IV is dated from 1589, immediately after the death of his predecessor, and not from 1594, when he was crowned, or in 1593, when he became a Catholic.