Local tradition, recorded by historian Healy in 1988, places the castle on the site now occupied by farm buildings behind where Marshalstown House once stood. The house itself has since been demolished, and no visible traces of the original castle structure remain amongst the agricultural buildings that have taken their place.

Historical records provide a glimpse into the castle’s significance during the Tudor period. In 1588, Arthur Hyde received a grant of lands that specifically included ‘the castle and lands of Ballymariscall alias Marshallstowne’, as documented by Grove White in his early 20th century historical writings. This grant came at a crucial time in Irish history, just after the failed Spanish Armada, when the English Crown was redistributing lands to loyal subjects as part of their efforts to secure control over Ireland.

The dual naming of the site as both Ballymariscall and Marshalstown reflects the complex linguistic heritage of the area, where Irish place names existed alongside anglicised versions. Kenneth Nicholls’ research confirms that Marshalstown’s position on the boundary between two major lordships would have made it an important defensive and administrative centre, though today only documentary evidence and local memory preserve its existence.