Lillerød, also called Allerød, seat of the municipality
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Allerød oscillation, a climatic period at the end of the last glaciation
The estate, which covered a large area (the present day municipalities of Hørsholm, Karlebo, Birkerød and a part of Allerød) was called the Noble Estate of Hørsholm (adelsgodset Hørsholm), and was endowed to various noblemen and members of the royal court.
In 1985, the headquarters of the Royal Life Guard moved to Høvelte Barracks, located between Allerød and Birkerød north of Copenhagen.