Ex officio oath

Procedure of the English court of Star Chamber

The ex officio oath developed in the first half of the 17th century, and was used as a form of coercion, persecution, and forcible self-incrimination in the religious trials of that era. It took the form of a religious oath made by the accused prior to questioning by the Star Chamber, to answer truthfully all questions that might be asked. It gave rise to what became known as the cruel trilemma where the accused would find themselves trapped between a breach of religious oath, contempt of court for silence, or self-incrimination. The name derives from the questioner putting the accused on oath ex officio, meaning by virtue of his office or position.

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