A castle once stood here, its presence marked on the 1563 map of Leix and Offaly, a document that captured the region during a turbulent period of Tudor conquest and plantation. Though no visible traces of the structure remain today, its inclusion on this early map suggests it played a role in the complex political and military landscape of 16th-century Ireland.

The 1563 map, referenced in Hore's work from 1863, provides valuable evidence of the castle's existence during a pivotal moment in Irish history. This was when the territories of Leix and Offaly were being transformed into Queen's County and King's County respectively, marking the first systematic attempt at English plantation in Ireland. Castles like the one at Grange Upper would have been strategic strongholds, whether held by Irish lords resisting English expansion or by new settlers establishing their claims to the land.

Today, visitors to Grange Upper will find only the undulating countryside that characterises this part of the Irish midlands, with no stone or earthwork to mark where the castle once stood. The site serves as a reminder of how much of Ireland's medieval heritage has been lost to time, conflict, and agricultural development. What remains is the documentary evidence; those careful notations on old maps that allow us to piece together the defensive networks and settlement patterns of centuries past, even when the physical structures have long since crumbled away.