"The worst of the dungeons was constructed in the following era by Potentate Versidue-Shaie on the ruins of the Lilmothiit community called Blackrose."
Imperial Geographic Society[src]

Blackrose Prison, colloquially referred to as simply The Rose, was a prison that was built in the city of Blackrose in the Imperial province of Black Marsh. Akaviri Potentate Versidue-Shaie ordered the construction of The Rose in the Argonian city of Blackrose in the Second Era,[2] and it was built from the nearby Lilmothiit ruins by Pelladil Direnni in a single day by summoning an army of Stone Atronachs to do the labor.[1]

The Rose was the most secure and notorious prison in Tamriel, holding the associates of Jagar Tharn who assisted him during the Imperial Simulacrum in the Third Era.[2]