The village has been, in times past, an important centre of iron and coal mining, though little evidence remains of this aspect of the village's history. The main historical landmark of the village is Ruardyn Castle, near to the parish church. In the past the village was spelt as Ruardyn and was part of Herefordshire. Nowadays the village lies inside Gloucestershire and is part of the Forest of Dean district. Like much of the surrounding area, Ruardean has historically been relatively poor; the 1831 census records 127 families, with half the population employed in agriculture and 160 people on poor relief. Today, St. John the Baptist's Church, dating from 1111 AD, is the village's centrepiece and main landmark, including a nave, chancel, tower and spire added in the 14th century and a chapel added in 1798. A manor house which once stood in the field behind the church was crenellated in 1310 to become Ruardyn Castle but this was largely destroyed by Oliver Cromwell's troops in the English Civil War. Ruardean's Congregationalist minister in the early 19th century was Reverend John Horlick. His relatives, James and William, were born in Ruardean and are today known worldwide for their hot malt drink Horlicks. The shed in which they first developed the technique of producing dried milk with malt, in the 1860s, still stands behind the Malt Shovel public house on the high street.
"Who killed the bears?"
A notable event in the town's history occurred on 26 April 1889. Four Frenchmen and their two bears were making their way to Ruardean, having performed in Cinderford. They were attacked by an angry mob, enraged by claims that the bears had killed a child and injured a woman. The bears were killed and the Frenchmen badly beaten. It soon became clear that the bears had not attacked anyone. Police proceedings followed and a week later 13 colliers and labourers appeared before magistrates at Littledean, charged with ill-treating and killing the bears and assaulting the Frenchmen. All but two were found guilty on one or more charges, with another convicted a week later. A total of £85 was paid in fines. A subscription was also launched which generously compensated the Frenchmen. The question "Who killed the bears?" was used for many years as an insult, directed particularly towards the people of Ruardean, despite the fact that all those convicted were from Cinderford. This caused a long-term feud between the inhabitants of the two towns.