Back وليام الرابع مركيز مونتفيرات ARZ Вилхелм IV (Монферат) Bulgarian Guillem IV de Montferrat Catalan Γουλιέλμος Δ΄ του Μομφερράτου Greek Guillermo IV de Montferrato Spanish Guillaume IV de Montferrat French Guglielmo IV del Monferrato Italian Willem IV van Monferrato Dutch Wilhelm IV z Montferratu Polish Guilherme IV de Monferrato Portuguese
William IV (c. 1030 – 1100) was the fifth Marquis of Montferrat from 1084.
The date of William's birth is unknown, but it most likely took place between 1030 and 1035. He was the eldest son of Otto II and Constance of Savoy.