In Act II of "A Midsummer Night's Dream", what is Oberon and Titania's relationship?

Oberon and
Titania are a married couple, the king and the queen of all the fairies.  At the beginning of
Act II, the two are in an argument, which causes all of Nature to be disrupted.  The royal
couple have such dominion over the whims of nature that their discord causes the world to be in
turmoil while they are not reconciled.  It is this domestic argument which provides the impetus
for much of the action of the play.

Oberon and Titania are at such odds that
when they meet Oberon says to her "Ill met by moonlight" (II.i.62)  Titania acuses
Oberon of having a mistress, and he calls her proud.  All this rancor has caused serious havoc
within the natural world:

As in revenge, have suck'd up
from the sea(90)
Contagious fogs; which, falling in the land,
Hath every
pelting river made so proud

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The ox hath
therefore...

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