Adelaide of Susa (also Adelheid, Adelais, or Adeline; c. 1014/1020 – 19 December 1091)[1] was the countess of part of the March of Ivrea and the Marchioness of Turin in Northwestern Italy from 1034 to her death.

After the death of her husband Otto, c.1057/60, Adelaide ruled the March of Turin and the County of Savoy alongside her sons Peter and Amadeus.

However, through Bertha's intervention, Henry received Adelaide's support when he came to Italy to submit to Pope Gregory VII and Matilda of Tuscany at Canossa.

[15] Bishop Benzo of Alba sent several letters to Adelaide between 1080 and 1082 encouraging her to support Henry IV in the Italian wars which formed part of the Investiture Controversy.

By contrast, Alexander II (writing c.1066/7) reproached Adelaide for her dealings with Guido da Velate the simoniac Archbishop of Milan.

[20] According to a later legend, she was buried in the parochial church of Canischio (Canisculum) in a small village on the Cuorgnè in the Valle dell'Orco, where she had supposedly been living incognito for twenty-two years before her death.

[22] In the cathedral of Susa, in a niche in the wall, there is a statue of walnut wood, beneath a bronze veneer, representing Adelaide genuflecting in prayer.

Above it is the inscription: Questa è Adelaide, cui l'istessa Roma Cole, e primo d'Ausonia onor la noma.

[23]Due to a late Austrian source, Adelaide and Herman IV, Duke of Swabia are sometimes mistakenly said to have had children together.