The Labour MP Ann Clwyd is to stand down at the general election.
Ms Clwyd, 76, has represented the South Wales constituency of Cynon Valley since 1984.
She has been a long-standing campaigner for human rights and more recently on standards in the NHS following the death in hospital of her husband, Owen Roberts.
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The Eisteddfod's intention to visit an area must be proclaimed at least a year and a day before the beginning of the festival.