Gerry Adams wins UK Supreme Court appeal over Maze Prison escape convictions
The former Sinn Fein leader claimed his two 1975 convictions were unsafe because his detention was not "personally considered" by a senior government minister.
Mr Adams, 71, attempted to escape from the Maze - also known as Long Kesh internment camp - on Christmas Eve 1973 and again in July 1974.
He was later sentenced to a total of four-and-a-half years.
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Hide AdAt a hearing in November, Mr Adams' lawyers argued that, because the interim custody order (ICO) used to initially detain him in July 1973 was not authorised by the then-secretary of state for Northern Ireland Willie Whitelaw, his detention was unlawful and his convictions should be overturned.
Announcing the Supreme Court's judgment at a remote hearing on Wednesday, Lord Kerr - the former Lord Chief Justice of Northern Ireland - said the court had unanimously allowed Mr Adams' appeal and had quashed his convictions.
The judge said Mr Adams' detention was unlawful because it had not been "considered personally" by Mr Whitelaw.
Lord Kerr said: "The making of the ICO in respect of the appellant was invalid since the secretary of state had not himself considered it.
"In consequence, Mr Adams' detention was unlawful, hence his convictions of attempting to escape from lawful custody were, likewise, unlawful."
Lord Kerr added: "The appeal is therefore allowed and his convictions are quashed."