The Tribunal had jurisdiction over the nobility of the Grand Duchy of Lithuania ( Duchy of Samogitia opted to join the Lithuanian Tribunal in 1588 ) .
Samogitia had a privilege to establish its own tribunal .
The Tribunal had jurisdiction over the nobility of the Grand Duchy of Lithuania ( Duchy of Samogitia , which had a privilege to establish its own tribunal , opted to join the Lithuanian Tribunal in 1588 ) .