Scott Roberts intends to convert the Ty Mawr in Gwyddelwern, Corwen, Denbighshire, which dates back to 1081, into a 90-cover gastropub.
Ty Mawr, which is owned by the pension fund of an individual, was let to Roberts by Colliers International in Manchester.
The restaurant on the upper floor of the Grade II listed building will serve locally sourced produce while downstairs there will be a community bar with log fire.
Roberts, originally from Llandudno, has spent the last few years operating restaurants abroad.
He said: “I returned to the UK in search of a new challenge and my vision of creating a modern gastro pub in a property dating back to the 11th century and literally steeped in history is certainly that.”