Arrrhhhh. DIFFERENT FROM COMMON LAW You quoted a common law principle not applicable in Portugal, because their system is based on civil law.
Just as a matter of interest is anyone else unable to understand what I'm saying?
I think maybe it needs to be simplified a bit. All jurisdictions draw a distinction between criminal law (self explanatory really) and civil law (disputes, property, defamation, family etc).
Then there are two different systems.
Common law - based on the principle of precedent where a decision by a court is binding on all lower courts for similar fact cases. This can be modified by an equitable (parliament) remedy where the common law produces unfair decisions.
Codified - used in continental Europe and based on Roman law. All law is governed by statute and precedent does not apply.
So you have, in England, civil and criminal law both based on the common law.
In Europe you have civil and criminal law based on a codified Roman law.
Before anyone starts nitpicking there are anomalies such as criminal defamation, and there is the tension between English and EU law, so there are shades of grey. At least 50