From the Wikipedia page 
Powys (/ˈpoʊɪs, ˈpaʊɪs/; Welsh: [ˈpowɪs]) is a principal area and county, and one of the preserved counties of Wales. It is named after the Kingdom of Powys which was a Welsh successor state, petty kingdom and principality that emerged during the Middle Ages following the end of Roman rule in Britain.
Powys was originally created on 1 April 1974 under the Local Government Act 1972, and originally had Montgomery and Radnor and Brecknock as districts under it, which were based directly on the former administrative counties. On 1 April 1996, the districts were abolished, and Powys was reconstituted as a unitary authority with a minor border adjustment in the northeast—specifically, the addition of the communities of Llansilin and Llangedwyn from Glyndwr district in Clwyd—and with moving the border, so that rather than half of Llanrhaeadr-ym-Mochnant, all is included.
The first Lord Lieutenant of Powys was previously the Lord Lieutenant of Montgomeryshire. The Lord Lieutenant of Brecknockshire and Lord Lieutenant of Radnorshire were appointed as Lieutenants. The present Lord Lieutenant is The Hon. Mrs Elizabeth Shân Legge-Bourke LVO of Crickhowell.
In December 2007 Powys was awarded Fairtrade County status by the Fairtrade Foundation.
See also: Powys County Council