Montgomeryshire, also known as Maldwyn (Welsh: Sir Drefaldwyn meaning "the Shire of Baldwin's town"), 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. The largest town is Newtown, followed by Welshpool and Llanidloes.