Rainier, Marquis of Montferrat

Rainier (1075–1137), son of Marquis William IV of Montferrat, ruled the marquisate from 1100. A charter of March 1111 names him Raynerius de Monteferrato Marchio, the first surviving document to call a lord of Montferrat marquis.

He founded the abbey of Santa Maria di Lucedio and steered his house toward the imperial court. In 1105 he married Gisela of Burgundy, and on his death in 1137 their only son succeeded him as William V.