Were weapons like swords allowed in Medieval Taverns and Inns? If not where would a knight or soldier leave his weapons if he was travelling? Was there a degree of arms control or code of ethics in Taverns?
Did knights just enter taverns with swords? How common were sword fights in taverns?
Almost any broad statement about law in medieval Europe is wrong because the middle ages is 500 or 1000 years across a whole continent. Imagining trying to say what weapons police in the North Atlantic in the fossil fuel era carry, and having to cover a British bobby in 1870 and a German airport policewoman in 2019! Medieval law was characterized by pluralism: rather than a neat hiererchy valid everywhere across a wide space (constitution overrules statutes which overrule local ordinances which overrule the rules of private organizations) there were multiple competing legal systems governing some kinds of people in some circumstances. The king and the town council both had THOUGHTS on who should have arms, and the church was determined that clergy were not subject to secular law.
But in later medieval England, several towns restricted the wearing of swords to those of the status of knight and above. We hear a lot about knifings and bludgeonings in English towns, but when people use bows, swords, spears, or axes it often seems to be premeditated (people went home, got their weapons, then came out to cause trouble). In 16th century England, carrying swords was much more common than it had been for centuries, but Guy Fawkes' fellow plotters still lost their swords and their cloaks when they were sitting in a tavern and someone came in with the hot goss that a papist bomb had been discovered under parliament. They exited out the back door and did not have time to go to the cloak room and retrieve their swords.
Of course, if the tavern was outside the city limits, town law would not apply! A 1454 law from Strassburg explicitly allows people to carry swords when returning from drinking parlours at night. We tend to know the least about how people outside the towns lived because they did not leave lots of records like the church, the courts, and the towns.
Further Reading