Agnes I (c. 1090 – 29 December 1125) was Abbess of Gandersheim and Quedlinburg.

She was the second daughter of Judith of Swabia and Władysław I Herman, Duke of Poland.

She was the granddaughter of Henry III, Holy Roman Emperor.

She was excommunicated by Pope Calixtus II for her loyalty to her maternal cousin, Henry V, the King of the Romans in 1119.

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