Hoorn or Horn, Philip de Montmorency, count of (both: hôrn) [key], 1518?–1568, Netherlands nobleman, member of the council of state during the regency of Margaret of Parma. In 1562 he joined with the count of Egmont and William the Silent in opposition to Cardinal Granvelle, who had introduced Spanish troops and the Spanish Inquisition into the Netherlands. When the duke of Alba replaced (1567) Margaret of Parma, he had Egmont and Hoorn arrested and, after an irregular trial, beheaded. That event caused great public outrage and marked the beginning of the open revolt against the Spanish.
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