shire is technically a county, and is an old Valyrian word for the same. More specifically, however, a shire is a unit of measurement that roughly corresponds with a county, which means that the grand and mega-counties of today are actually composed of multiple shires. In legal terms, this means that mega counties get more than only two Knights of the Shire to send to the House Comitates, and it also means that mega counties will receive more than one appointed “shire-reeve”, or sheriff.