 The nickname for Amersfoort, "Keistad" (boulder-city), originates in the "Amersfoortse Kei", a boulder that was dragged from the Soest moors into the city in 1661 by 400 people because of a bet between two landowners.The people got their reward when the winner bought everyone beer and pretzels.Other nearby towns then nicknamed the people of Amersfoort "Keientrekker" (boulder-puller).