I can't seem to find any rules on a knight wielding two weapons at once. Would a knight have to have a separate combat skill for a Florentine fighting style? Or would each two-weapon combat roll incur a multiple-action penalty? Or is there a different mechanic involved?
I apologize if there's a rule on this buried in the text somewhere. If you could point me to it, I would appreciate it.
There is a two-weapon fighting in the tournament of dreams supplement, but it's unbalanced and should not be used.
In my opinion, shield and sword fighting is superior to two weapon fighting, swashbuckling movies be damned, and two-weapon fighting does not belong in an arthurian game except as an occasional exotic thing to be encountered - say, the odd faerie knight.
If you want a balanced rule, something like this: allow players to fight with two weapons, and each turn, have them choose which they are attacking with. That's the skill they use. The advantage is: if they drop a weapon or break one, they still have one in hand and suffer no round of having to recover. The disadvantage is: just like two-handed sword, they get no shield.
Note: using a weapon defensively is already a part of the system. When you make an opposed roll, you are both attacking and defending, and if you roll higher than your foe, it is likely because your defence was good enough to allow you to get an opportunity to strike.
If off-handed weapons were allowed a protection similar to shields, then 2-handed swords should get them too, because authentic historical two-handed sword fighting has lots of defensive aspects to it.
So, a second, off-hand weapon does not grant extra armour protection. If you want that, use a shield.