The iron maiden is younger than the steam engine.
No source mentions an iron maiden before the 19th century. The famous Nuremberg version went on show from about 1802; its supposed first use on a coin forger on 14 August 1515 traces back to the writer Johann Philipp Siebenkees and is considered fabricated.
Useful: With any torture device, first ask when it was first mentioned in writing.
Source: en.wikipedia.org