John I of Montferrat

John I, called the Just (c. 1277–1305), was the last Aleramici marquis of Montferrat, the only son of William VII and Beatrice of Castile. Guarded as a boy by the rulers of Saluzzo and Naples, he later fought to recover his towns from Asti and Alessandria.

In 1296 he married Margaret of Savoy but had no children. His league drove Matteo Visconti from Milan in 1302 and Asti submitted in 1303. Dying in 1305, he made his nephew Theodore Palaiologos his heir, bringing the Palaiologoi to Montferrat.