Roman law
Justinian code
civil law
jus civile

Roman law held that neither government nor private parties could cut off such access.

Two things seem relevant here, both minor points of Roman law.

In Roman law, a marriage was simply an agreement between two free parties.

Roman law required brides to be at least 12 years old.

His most important achievements are in the field of Roman law.

Roman law also had wide influence on Western political theory.

In the eyes of Roman law, people were not equal.

The focus of his work was on legal history and Roman law.

Apart from this work, he was internationally well known for his studies on Roman law.

As such, he became the first teacher of Roman law.