<Li> The standard types of contract (sale, contract for work, hire, contract for services) regulated in most continental codes and the characteristics of each of these contracts were developed by Roman jurisprudence . </Li> <Li> The classical jurist Gaius (around 160) invented a system of private law based on the division of all material into personae (persons), res (things) and actiones (legal actions). This system was used for many centuries . It can be recognized in legal treatises like William Blackstone's Commentaries on the Laws of England and enactments like the French Code civil or the German BGB . </Li> <P> The Roman Republic had three different branches: </P> <Ul> <Li> Assemblies </Li> <Li> Senate </Li> <Li> Consuls </Li> </Ul>

What were the basic legal concepts that the romans developed