Aleid van Poelgeest

Aleid of Poelgeest (Koudekerk aan den Rijn, c. 1370 - The Hague, September 22, 1392) was the mistress of the Count of Holland, Albert I of Bavaria.

She is traditionally assumed to have served as a maid-of-honour to the spouse of Albert, Margaret of Brieg, prior to becoming his mistress.

In June 1388, Albert gave her an allowance, her own house and maids and installed her as his official mistress.

On the night of 22–23 September 1392, she was murdered along with the "Meesterknaap" (a high court dignitary), William Cuser in The Hague by Hook nobles.

Albert saw the murder as a personal attack on his authority and used this event to settle scores with a number of political opponents.