The Vatican is to publish a book which is expected to shed light on the demise of the Knights Templar, a Christian military order from the Middle Ages.
The book is based on a document known as the Chinon parchment, found in the Vatican Secret Archives six years ago after years of being incorrectly filed.
The document is a record of the heresy hearings of the Templars before Pope Clement V in the 14th Century.
The official who found the paper says it exonerates the knights entirely.
Prof Barbara Frale, who stumbled across the parchment by mistake, says that it lays bare the rituals and ceremonies over which the Templars were accused of heresy.