A gedetineerde (literally: detained) is a prisoner. You may find them in prison records. From the late 1800s, some prisons took photos of their prisoners. You can find those in the records of the prison, usually kept at the archives in the provincial capital. You can also check the secret register of released prisoners.

Six prisoners in the prison in The Hague, 1890. Call no. 484, Records of prisons The Hague, Record Group 3.05.04, National Archives, The Hague.