In the Middle Ages there were five villages in the area of today's Devecser: Devecser, Kisdevecser, Szék, Meggyes, and Patony. These villages expanded in the 12th and 13th century. There is an Esterházy castle in the town.
History
This section needs expansion. You can help by adding to it. (April 2013)
In October 2010, a sludge reservoir at the Ajka aluminum plant burst its banks, killing at least four people and injuring more than 120.[4] Part of the town had to be erased due to the soil contamination, leading to the removal of some houses.