A popular walking spot will be closed to the public after a number of dog owners flouted the rules.
Dunston Field, at Caistor Roman Town, will be closed from Sunday, January 15, to allow sheep a safe space to graze.
The space is privately owned by the Norfolk Archaeological Trust which has said that a number of visitors not keeping their dogs on leads or picking up their dog's mess were behind its decision to close the 22-acre field.
According to the trust, pregnant ewes are unable to graze on the field due to the amount of offending visitors.
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Natalie Butler, Norfolk Archaeological Trust director, said: "This is an awful situation for us to be in, we want to keep our sites open for visitors to explore and enjoy.
"Unfortunately, visitors have disregarded the rules and forced us into this situation."
Caistor Roman Town, also known as Venta Icenorum, is a 120-acre site south of Norwich and one of Norfolk's most remarkable archaeological landmarks.
The town was first established in the AD70s as the capital of the Iceni tribe - whose Queen Boudicca led a revolt against the Romans.
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