Montgomeryshire, also known as Maldwyn is one of thirteen historic counties and a former administrative county of Wales. It is named after its county town, Montgomery, which in turn is named after one of William the Conqueror's main counsellors, Roger de Montgomerie, who was the 1st Earl of Shrewsbury.
Montgomeryshire today constitutes the northern part of the principal area of Powys. The population of Montgomeryshire was 63,779 according to the 2011 census, with a low population density of 29 people per square km. The current area is 2,174 square km (839 square miles).