⁵Brady, Conor, et. al. “Recent geophysical investigations and LiDAR analysis at the Hill of Slane, Co. Meath.” Ríocht na Midhe, Meath Archaeological & Historical Society, XXIV (2013): 134–55.
According to the authors, "It is interesting that le Fleming followed a deliberate strategy in the construction of his stronghold at Knowth in appropriating an existing mound and modifying it. The reference to the Dumhach S láine suggests that he may have followed the same strategy for the construction of his centre at Slane. Thus, it seems certain that the first castle at Slane, le Fleming’s motte, was built overlying an important prehistoric site close to the medieval parish church."