The coat of arms of Keerbergen goes back to the coat of arms of the Berthout van Berlaer, who governed the manor of Keerbergen from 1314 to 1433.[2] To distinguish the municipal coat of arms from other municipalities that adopted the coat of arms of this family, Saint Michael, the patron saint of the parish, was placed behind it.[2]
The oldest seal of the aldermen of Keerbergen dates from 1308 and bears a shield with three poles with the text: "scabinorum de Kerberghe". It was the coat of arms of the lords of Berthout van Berlaer. The aldermen of Keerbergen used a seal with the coat of arms of the first lords of Berlaer. This seal was in use until 1492. Even on other seals, which are kept at the state archives in Brussels, the same emblem can be seen (1540 - 1697 - 1786). On December 24, 1954, the municipal council of Keerbergen inquired with the Council of Nobility about the former coat of arms. In a letter from the provincial government of Brabant dated September 10, 1955, addressed to the council of aldermen, the following was stated: The council has determined that the municipality in question has proven that its aldermen used the requested weapon under the ancien régime. He therefore ruled that a favorable outcome can be reserved for the request in question.
The coat of arms to be recognized by the said municipality should be described as follows: OF SILVER WITH THREE POLES OF THROAT, THE SHIELD PLACED IN FRONT OF A SAINT MICHAEL, WITH RAISED SWORD OF GOLD, WHO KILLS DOWN A DEVIL OF SABER.
The text in French reads: "D'argent à trois pals de gueules, l'écu posé devant un Saint Michel, l'épée haute d'or terrassant un demon de sable".