|Marquess of the Treasury of the Most Preferable|
Earldom of the Island
The Most Honourable|
My Lord Marquess
|Residence||Allain House, An Bhá nan Éirith Ghréine|
|Term length||5 years|
|Formation||Since Time Immemorial|
The Marquess of the Treasury of the Most Preferable Earldom of the Island of Rockall (Rockallian:An Ardailigh na Shtáidchíste na nFhéarrach Iarlateachd nan Oilín Ruicheall, Fernolian: An Marcis na Stádtchiste nIrliticht Fírric nEoil Rúichill, Astrallic: An Airdilighd nan dTriosuairléise nan Iorlteachd Feaoinnic nan Oileun Rucall), officially titled The Most Honourable the Marquess of the Treasury and Economic Affairs in the Service of the Earl of the Most Preferable Earldom of the Island of Rockall is the finance minister of the nation of Rockall in the Seafaring Confederation. The Marquess is the leader of the Marquessate of the Treasury.
Since January 14, 2007, the Marquess of State of Rockall has been Sath tSluaigh.