When did common law originate?
Common law
categorizing and prioritizing rights to property—for example, the same article of property often has a "legal title" and an "equitable title", and these two groups of ownership rights may be held by different people.
in the United States, determining whether the Seventh Amendment's right to a jury trial applies (a determination of a fact necessary to resolution of a "common law" claim)[34] vs. whether the issue will be decided by a judge (issues of what the law is, and all issues relating to equity).
the standard of review and degree of deference given by an appellate tribunal to the decision of the lower tribunal under review (issues of law are reviewed de novo, that is, "as if new" from scratch by the appellate tribunal, while most issues of equity are reviewed for "abuse of discretion", that is, with great deference to the tribunal below).
the remedies available and rules of procedure to be applied.