A visitor centre which is thought to stand on the site of Owain Glyndwr's old parliament is to receive a £275,000 grant.
It is part of an ongoing project to extend and renovate the Owain Glyndwr Centre in Machynlleth, Powys.
The money has come from monuments body Cadw and will be used to restore the Grade I-listed Parliament House, home of the centre.
The centre has also applied for £2.5m from the Heritage Lottery Fund.
Parliament House was built in about 1460 and is understood to stand on the site of Glyndwr's parliament.
It has previously received a grant of £41,000 from Cadw which paid for a new heating and lighting system, and for the restoration of a mural of Glyndwr leading his warriors into battle.
In a statement, the centre spokesman said the latest financial boost of £275,000 would help restore the "fabric of Parliament House which is a Grade I-listed building".
A lime plaster ceiling will be refurbished as part of the project and will also be used to fund an exhibition.
The Owain Glyndwr Centre tells the story of the Welsh uprising from 1400. It opened in 1981.
The rebel leader was crowned as Prince of Wales at Machynlleth in 1404.
He is thought by many to be one of the great heroes of Welsh history.