So, there I was sitting and the question was about defining and distinguishing between the French executive system and the British judicial one.
And all I could think about was how in Ferelden, rulership arises from the support of the freeholders who swear their fealty to Arls who gather annually to hold the Landsmeet, a council which functions as the official legislative body of Ferelden and it can even override the king or queen on any matter of law.
In comparison, Orlais is an absolute monarchy where the supreme executive power resides with the Emperor.
If you're talking medieval law, the French system was also known as the "inquisitorial system" 
When you pass a judgement in DAI, you're using the inquisitorial system. You have a law expert there to present the case. The accused gets no lawyers. There is no jury. The medieval French system, the judge had advisers, but there was no one there for the accused, and none of the "innocent until proven guilty" stuff that was part of the medieval British system.
(There were small trial systems that were local, but I'm talking the French court's system. The court could try anything that was "treason" to the king, and the king's people defined larger and larger numbers of crimes as technically treason so they could expand the court's power over the law. For instance, heresy was treason because the king got his power from God, and therefore any questioning of God was a questioning of the king.)
The Brits had a system much like the modern west's early on. It had evolved out of the old Germanic system (that'd be the Alamarri barbarians of Ferelden) and involved juries, advocates, and a presumption of innocence - all re-affirmed and made modern by the Magna Carta. In the early days, it also involved duels and other trials of ordeals, but the church finally stamped those out.
And you see that at the Landsmeet, when they decide to settle a dispute in full view of a house of lords with an old-fashioned trial by ordeal, when you fight Loghain.
As a medieval history geek, I'm always astonished by how well these guys have done their research 