An Anti-Parnellite, he was an Irish National Federation Member of Parliament (MP) for North Meath from 1893 to 1900.
He was elected to the United Kingdom House of Commons at a by-election on 21 February 1893, after the result of the 1892 general election in North Meath was overturned on petition[2] at the next general election, in 1895, Gibney was re-elected with a narrow majority over the Parnellite candidate John Sweetman.
[3] At the 1900 general election, when the Irish Parliamentary Party reunited after its 9-year split, Gibney stood as a Healyite Nationalist and lost seat to the Irish Parliamentary Party candidate Patrick White.
He married firstly Bridget Hennesy (d. 1895), daughter of John Hennesy, Millbrook Mills, Oldcastle, and Castlepollard; and secondly Catharine O'Brien, daughter of Michael O'Brien, Oldtown, Navan.
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