These wings allowed for individual cells for prisoners. Similar designs were then used in 54 other prisons, including Ruthin. Ruthin prison's 4-storey Pentonville-style wing was built in 1878.

1000 to the present day Prisoners at Pentonville prison spent nearly all their time alone and in their cells, for as many as 23 hours in each day. This was called the separate system, and it was ...