What is a guild? what did medieval guilds do?

A guild is a group or association of traders or craftsman. Every guild focused on a particular trade in particular area e.g  potters guild etc.

The Medieval guilds controlled prices, working hours, standard of products and used to define trade rules and regulations. They had their own courts to resolve their matters. Besides they used to play an important role in society.

lying without the limits of the several states; and may permit them, at such times, and in such manner as it

gaius cassius longinus and marcus junius brutus, former enemies of julius caesar who'd joined the roman senate, led caesar's assassination, dubbing themselves "the liberators." and the second one is   the assassination of julius caesar was the result of a conspiracy by many roman senators led by gaius cassius longinus, decimus junius brutus albinus, and marcus junius brutus. they stabbed caesar (23 times) to death in a location adjacent to the theatre of pompey on the ides of march 15 march 44 bc.