Resumen:
A map in the National Archives dated to 1531 showing part of the Fylde in Lancashire has been published on several occasions; but its relationship to another map in the National Archives has not previously been recognised. These two maps were made by the opposing parties in a dispute before the court of the Duchy of Lancaster, and may be the earliest examples of adversarial map-making in a case before an equity court. The case concerned land which had apparently long been regarded as intercommon, but which was now being claimed to be in exclusive ownership. The newly recognised map was made to illustrate recently acquired documentary evidence as to the ownership of the land in question. This map appears broadly trustworthy, and was accepted as such by the court; but the defence map seems rather to have been designed to mislead. In recent years the defence map has been regarded as evidence for the appearance of the locality concerned in the 1530s, but this study shows that it was in fact regarded by the court as unreliable, thus highlighting the need to treat all maps other than those actually commissioned by the courts themselves as partial and therefore suspect
