Dueling is an odd tradition and still carries on today in some parts of the world.
In the UK the (supposadly) last duel fought was in Kirkcody in the Kingdom of Fife just north of Edinburgh.
It was between a merchant and a somewhat reptilian banker. The good news is the banker who caused the duel to happen died but the merchant was tried for his murder (but was aquited and had his good name restored).
Kirkcody is also once the home of one Adam Smith (ask an economist if you don't know who he is).
It is also the home of one Mr G.Brown who has just thrown down a duel to others in the name of a General Election, where he hopes to get re-elected (ie keep his seat) and that his party get a clear majority so he can carry on being Prime Minister of the UK.
Anyway back to dueling it had some very odd rules, a lot of which where dreamed up by the French and their out of date notion of "courtly behaviour" by Knights and nobles etc.
First of all a chalenge had to be issued correctly, and should only be by a peer of the person being chalanged. Thus the lower class riff raff could not chalenge a member of a higher class to a duel unless through a second who was of the same class.
Each participant had to have a "second" who had a number of duties one of which was to stand in for the challenged should they abscond. Royals where always considered to be untouchable (Godhead) so they had an ordinary mortal to stand in their place known as "The King's Champion".
Now there was the choice of weapons and the only rule was that you had to be capable of killing your opponent with it with a single blow or action. Thus swords, spears, maces, war hammers, and all sorts of other grissly weapons where acceptable. However it had to be either a weapon of personal combat or one that required skill, so hand thrown bombs and shotguns where not acceptable. Oh and they had to be available as a "matched pair".
Now there was an interesting rule about what should happen with the likes of "one shot" weapons of skill. If the chalenger fired and missed or only inflicted a very minor wound then it was upto the chalenged to decide if the dual should continue, thus they could chose to "spare the chalenger" but not the other way around.
There where also complicated rules as to "when honour had been satisfied" in the case when a wound was inflicted or the combatants had not the energy to carry on (we see this still in sports like boxing where "the towel is thrown in").
There where also "reason rules" as to how duals could be avoided. Direct chalenges that where "pressed" could never be avoided, however chalenges through seconds could be settled by the seconds.
Thus chalanges that came about through hearsay (tale telling) could be resolved amicably.
However if a direct chalenge was issued the chalenged could ask the person chalenging to send their second to speak to their second. Thus effectivly invoking the "reason rules".
One reason for this is a Gentelman never spoke about or considerd money, and in many cases never ever saw it let alone carried it. It was a mater for a "man servants" or "tradesmen". Which is one of the reasons what we now call "business cards" came about through "calling cards" that is you could present your card (or ask for anothers) and ask that the man servents meet.
Now somewhat oddly a lot of the rules about duels also applied to matters of the "heart". It was not considered seamly for a man to directly aproach a maiden, and absolutly unacceptable for a maiden to aproach a man. There where ways to resolve this "officialy" through "seconds" or secretaries, or "unofficialy" through man servents and ladies in waiting etc that we would now call "the best man" and "the maid of honour" (she was supposed to protect her ladies chastity amongst other things).
Thus the rule about why a maid of honour or best man should not only be not married but "chaste" as well. In the case of a "runnaway" bride or groom, the second had to stand in instead...
Although dueling was effectivly illegal over two hundred years ago in Britain, the attendant social behaviour managed to survive into the last century where WWI gave it the mortal blow and it mostly had died out before WWII.
Back in the last century I looked into dueling and it's effects on social behaviour out of interest, but my mind grows dim with the ins and outs of it. If you want to know more there are a couple of books on dueling etiquet and as they are long long out of copyright you might find them on Google books.
Oh and appart from the invention of lino Kirkcody has another claim to fame, the last man to stand in the dock at the Old Baily Magistrates Court was from there.
Finaly the Muslim faith actually has laws against dueling and honour killings specificaly because it was so rife at the time.