Finds from an archaeological dig around Clare Castle in May were so “spectacular” archaeologists from Cambridge University are returning to the site.
Experts are planning a second dig from September 9 to 13 after getting extra funding based on what they found in four trenches in the castle grounds.
Carenza Lewis, who has featured on the TV programme Time Team, led the dig.
Her team discovered a previously unknown human burial site consisting of 11th century remains from when the castle was first built.
They also uncovered was evidence of the castle’s demolition in the 16th century, with the dig described as a “thrilling success” by Mrs Lewis.
She added: “We discovered that the medieval archaeology in the centre of the bailey, far from having been completely destroyed by the railway line, actually survives in every part of the site, which is remarkable.
“The dig was so successful that we are now going to be able to come back.”