Been digging through the non-schizo interpretations of revelations regarding 6, supposedly this was written about roman decline, this is all the interesting shit I've found:

Conquest
>White rider was considered a good thing up until revelations as Christ (the lamb) by Christians, revelations denoted him as the herald of the apocalypse or the anti-christ.
>Supposedly he was deliberately depicted as not having arrows for his bow, as he didn't actually need them.
War
>The second Horseman may represent civil war as opposed to the war of conquest that the first
>the rider's possession of a great sword,
>The sword held upward by the second Horseman may represent war or a declaration of war, as seen in heraldry
Famine
>who sat on it had a pair of scales in his hand
>The third Horseman rides a black horse and is popularly understood to be Famine as the Horseman carries a pair of balances or weighing scales, indicating the way that bread would have been weighed during a famine. Other authors interpret the third Horseman as the "Lord as a Law-Giver" holding the Scales of Justice.
Death
>had the name Death, and Hades was following with him.
>This fourth, pale horse, was the personification of Death with Hades following him jaws open receiving the victims slain by Death.
>Unlike the other three, he is not described as carrying a weapon or other object, instead, he is followed by Hades (the resting place of the dead).
>horse is greenish