The location chosen by St. Patrick for first pascal fire 

This site overlooking Slane village is reputedly the location where the Fir Bolg King Sláine’ is buried. It is also where St. Patrick chose to light the First Paschal Fire in 433. This was in defiance of King Laoire as lighting a fire anywhere in Ireland was forbidden while the King’s own festival fire burned at The Hill of Tara. King Laoire was so impressed by Patrick’s courage that he let him continue his missionary work. Patrick then appointed Erc, the King’s servant to be his first Bishop and ordered him to establish a monastery here. One thousand years later in 1512, Sir Christopher Flemming established a Franciscan friary at the top of this hill. Besides being abandoned for 20 years after the Dissolution of the Monasteries, it remained a place of worship for over 200 years up until it was abandoned for the last time in 1723.

Thanks to ItsmyIreland for excellent video