International, constitutional and administrative law, legal law, contract, tort, property law and trusts are regarded as the “traditional core topics”, although there are heaps of additional disciplines. Roman law was heavily influenced by Greek philosophy, but its detailed guidelines had been developed by professional jurists and have been highly subtle. In medieval England, royal courts developed a body of precedent which later grew to become the common law. A Europe-wide Law Merchant was shaped in order that merchants could trade with common standards of apply somewhat than with the many splintered facets of native laws. The Law Merchant, a precursor to modern industrial law, emphasised the liberty to contract and alienability of property.
The Corpus Juris Canonici, the elemental collection of canon law for over 750 years.
When contracts are invalidated for some reason (e.g. a car buyer is so drunk that he lacks legal capability to contract) …