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Lord Dunraven, Lord Barrymore, Lord Mayo and Lord Castletown, Sir John Keane of Cappoquin, Villiers Stuart of Dromana, Moreton Frewen, were a few of the more notable adherents who supplied political and financial support.
He was the second son of Sir John Keane, 1st Baronet, of Cappoquin (see Keane Baronets for earlier history of the family).
In 1925 he was a major opponent of the Shannon electrification scheme, describing it as "the poisonous virus of nationalisation".
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The UK's National Portrait Gallery includes three photographic portraits of Sir John Keane taken by Bassano's studio on 30 March 1920.