The incident is believed to have happened between late April and early May.
Gardaí are appealing for witnesses after entry to a historical Laois site was damaged with graffiti.
Black spray-painted graffiti appeared on an archway at the entrance to the Rock of Dunamase.
The criminal damage is believed to have occurred between late April and early May.
Investigators are asking anyone who was in the area at the time to come forward.
Anyone with information can contact Portlaoise Garda Station, the Garda Confidential Line or any Garda Station.
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