The importance of charters in legal disputes over land as evidence of land tenure, gave rise to numerous charter forgeries, sometimes by those same monastic houses in whose archives they were preserved. The primary motivation for forging charters was to provide evidence of rights to land. Often forging was focussed on providing written evidence for the holdings recorded as belonging to a religious house in the "Domesday Book". It is important when studying charters to establish their authenticity. The study of charters to determine authenticity gave rise to diplomatics – the science of ancient documents.