For a short while, Aalst was a separate municipality. In 1818, it became a part of the municipality of Poederoijen.[3] According to the historian Van der Aa, there used to be an old castle here, but only a few remnants were left in the middle of the 19th century.[4]
It was first mentioned in 850 as "Halosta". Baldericus donated some pieces of land to the Benedictine monastery called Laurisheim. The etymology is unclear.[5] Aalst developed into a stretched out esdorp. Part of the Protestant church dates from the 12th century.[6] In 1840, it was home to 481 people.[7]
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