It is not the torture, but the cause which makes the martyr - Saint Augustine

Archbishop Engelbert enforced clerical discipline, helped establish the Franciscans and the Dominicans in his diocese, built monasteries and insisted on strict observance in them, and used a series of provincial synods to regulate church matters. He was loved by his people for the stability and security he brought, many of the nobility hated and feared him. His devotion to duty, and his obedience to the pope and to the emperor, were eventually the cause of his ruin. He was stabbed to death on the evening of 7 November 1225 near Schwelm, Germany, by a member of his own family.