Gréaig Ruatheairreut-Nuabhdheaoil na Grúailleagh, Baron Ruatheairreut-Nuabhdheaoil na Grúailleagh of An Móir Leautheinn, in His Capacity for the Supreme Court

Gréaig Deoinne Séabhoin Ruatheairreut-Nuabhdheaoil na Grúailleagh, Baron Ruatheairreut-Nuabhdheaoil na Grúailleagh of An Móir Leautheinn, in His Capacity for the Supreme Court, OS PC MAML (Rt Hon.) (born 2 July, 1944) is a Rockallic Astrallic-speaking Justice of the Supreme Court of the Seafaring Confederation representing the Viscountcy of An Móir Leautheinn.

In 1985 he became a Justice of the Supreme Court of An Móir Leautheinn, taking over from Téainnáigh Chreainneaduaid, who was retiring. Here he stayed until 1992, when he was appointed to be the Justice for An Móir Leautheinn on the Supreme Court of the Seafaring Confederation. As he became a Justice of the Supreme Court representing An Móir Leautheinn, his title officially became The Baron Ruatheairreut-Nuabhdheaoil na Grúailleagh of An Móir Leautheinn, in His Capacity for the Supreme Court (Astrallic: An Báiriúin Ruatheairreut-Nuabhdheaoil na Grúailleagh Nan Mhóir Leautheinn, i tSeoinn Cainneaighdleadh am tSleaoishgh Óreaighleaifhdhealchdagh), or Marquess of An Móir Leautheinn (Astrallic: Máircheaise Nan Mhóir Leautheinn).