Boniface I, Marquis of Montferrat

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Boniface I
Boniface elected as leader of the Fourth Crusade, Soissons, 1201: history painting by Henri Decaisne, early 1840s, Salles des Croisades, Versailles.
Marquis of Montferrat
Reign	1192–4 September 1207
Predecessor	Conrad of Montferrat
Successor	William VI, Marquis of Montferrat
King of Thessalonica
Reign	1205–4 September 1207
Successor	Demetrius of Montferrat
Born	c. 1150
Died	4 September 1207
Spouse	Helena del Bosco Margaret of Hungary
Issue	William VI, Marquis of Montferrat Beatrice of Montferrat Agnes of Montferrat Demetrius of Montferrat
House	Aleramici
Father	William V, Marquis of Montferrat
Mother	Judith of Babenberg

Boniface I, usually known as Boniface of Montferrat (Italian: Bonifacio del Monferrato; Greek: Βονιφάτιος Μομφερρατικός, Vonifatios Momferratikos) (c. 1150 – 4 September 1207), was the ninth Marquis of Montferrat (from 1192), a leader of the Fourth Crusade (1201–04) and the king of Thessalonica (from 1205).