Aleid van Poelgeest

Aleid of Poelgeest (Koudekerk aan den Rijn, c. 1370 - The Hague, September 22, 1392) was the mistress of Count of Holland, Albert I of Bavaria.
She was murdered at an early age along with the "Meesterknaap" (a high court dignitary), William Cuser in The Hague by Hook nobles. Why exactly Aleid was killed, is not certain.
Albrecht saw the murder as a personal attack on his authority and used this event to settle some scores with a number of political opponents.