Medieval Roman law in the context of Advocatus

An advocatus, sometimes simply advocate, Vogt (German, pronounced [foːkt] ), Fauth (Old High German) or avoué (French, pronounced [avwe] ), was a type of medieval office holder, particularly important in the Holy Roman Empire, who was delegated some of the powers and functions of a major feudal lord, or for an institution such as an abbey. They typically had responsibility for the "comital" functions which defined the office of early medieval "counts", such as taxation, recruitment of militias, and maintaining law and order. This type of office could apply to specific agricultural lands, villages, castles, and even cities. In some regions, advocates came to be governors of large provinces, sometimes distinguished by terms such as Landvogt.

In different parts of medieval Europe, the term advocate developed different meanings, and other terms were also sometimes used to represent similar offices. For example, Anglo-Norman comital functions for larger districts were executed by vicomtes in Normandy, and sheriffs in England. In contrast, the advocatus or advocate as an officer of a court of law, which is still current in modern English, first appeared in the 12th and 13th centuries, concomitant with the rediscovery of Roman law. The common thread which connects the different meanings of advocate is that someone is called upon to perform a function for others.

The scholars of the 11th- and 12th-century legal schools in Italy, France and Germany are identified as glossators in a specific sense. They studied Roman law based on the Digesta, the Codex of Justinian, the Authenticum (an abridged Latin translation of selected constitutions of Justinian, promulgated in Greek after the enactment of the Codex and therefore called Novellae), and his law manual, the Institutiones Iustiniani, compiled together in the Corpus Iuris Civilis. (This title is itself only a sixteenth-century printers' invention.) Their work transformed the inherited ancient texts into a living tradition of medieval Roman law.

The glossators conducted detailed text studies that resulted in collections of explanations. For their work they used a method of study unknown to the Romans themselves, insisting that contradictions in the legal material were only apparent. They tried to harmonize the sources in the conviction that for every legal question only one binding rule exists. Thus they approached these legal sources in a dialectical way, which is a characteristic of medieval scholasticism. They sometimes needed to invent new concepts not found in Roman law, such as half-proof (evidence short of full proof but of some force, such as a single witness). In other medieval disciplines, for example theology and philosophy, glosses were also made on the main authoritative texts.

In real estate, air rights are the property interest in the "space" above the Earth's surface. Generally speaking, owning or renting land or a building includes the right to use and build in the space above the land without interference by others.

This legal concept is encoded in the Latin phrase Cuius est solum, eius est usque ad coelum et ad inferos ("Whoever owns the soil, it is theirs up to Heaven and down to Hell."), which appears in medieval Roman law and is credited to 13th-century glossator Accursius; it was notably popularized in common law in Commentaries on the Laws of England (1766) by William Blackstone; see origins of phrase for details. In the 20th century, the splitting of air-rights from the underlying property became an important issue for property development, particularly for skyscrapers in some crowded cities.