Otto or Oddone in Italian, (1010 or 1020 – c. 1057) was Count of Savoy from 1051 (or 1056) until his death. He ascended the throne after the death of his elder brother, Amedeo.
Otto substantially enlarged his lands through his marriage with Adelaide of Susa, countess of Turin and Lady of the Italian Mark, a title she had inherited from her father Olderico Manfredi. After this acquisition the House of Savoy concentrated his expansion efforts towards Italy instead of outside the Alps as they had done before. Savoy's lands occupied much of modern Savoy and Piedmont, although several other small states could be find between them.
Family
He married Adelaide, heiress of Turin and Susa, and had five children.