The castle will house one of only four copies of the Magna Carta
A multi-million pound redevelopment of Lincoln Castle has moved a step closer after an early funding boost.
The Heritage Lottery Fund has given the county council's £6m bid initial approval and it can now go for more detailed consideration.
The project, which has a budget of more than £15m, would see a new exhibition centre, visitor workshops and the completion of the wall walk.
The council was also awarded more than £250,000 to develop the bid.
A decision is expected in 2011.
Lincoln's copy of the Magna Carta would be moved to the new exhibition centre in the current court building.
The Grade II* listed castle prison will also be improved with new exhibition spaces.