A couple of entrepreneurs from Meath purchased it.
A Westmeath castle has changed hands for just under 10 million euro.
The palatial estate at Knockdrin was initially put on the market in 2017 for 13.5 million euro, but attracted no buyers.
Meath entrepreneurs Noel and Valerie Moran have secured the property from former DCU President Professor Ferdinand von Prondzynski, who's family owned it for 60 years.
The Irish Times reports there was significant interest in the 1,000 acre site from both Ireland and abroad.