Visigothic Code in the context of "Duchess of Aquitaine"

The duke of Aquitaine (Occitan: Duc d'Aquitània, French: Duc d'Aquitaine, IPA: [dyk dakitɛn]) was the ruler of the medieval region of Aquitaine (not to be confused with modern-day Aquitaine) under the supremacy of Frankish, English, and later French kings.

As successor states of the Visigothic Kingdom (418–721), Aquitania (Aquitaine) and Languedoc (Toulouse) inherited both Visigothic law and Roman Law, which together allowed women more rights than their contemporaries would enjoy until the 20th century. Particularly under the Liber Judiciorum as codified in 642/643 and expanded by the Code of Recceswinth in 653, women could inherit land and titles and manage their holdings independently from their husbands or male relations, dispose of their property in legal wills if they had no heirs, represent themselves and bear witness in court from the age of 14, and arrange for their own marriages after the age of 20. As a consequence, male-preference primogeniture was the practiced succession law for the nobility.

The Law of Portugal is part of the family of what in English-speaking countries are sometimes called the "civil law" legal systems, referring to legal systems that developed at least in conversation or close ties with systems influenced by the ius commune medieval European tradition of Roman law (however, Scandinavian legal systems are often counted as such, despite the former not penetrating in influence, as opposed to local North Germanic customary law). As such, it has many common features with the legal systems found in most of the countries in Continental Europe.

Along its history, the law practiced in Portugal started to be based in the customary law of the indigenous peoples that initially occupied the region, that was later influenced by the Roman and Visigothic laws. From the 13th until the 18th centuries, the main influence was the Justinian and Canon laws. In the 18th century, the main influence started to be the natural law.