Lyric discussion by Toonlink13 

Cover art for Queen of Peace lyrics by Florence + the Machine

Like the other meanings propose,Florence is the one who tries to keep peace in the relationship,but the man always ruins it.

"Oh,the king/Gone mad within his suffering/Called out for relief/Someone cure him of his grief"

The man she's with is suffering from something that happened in his recent past,and the fact that she says "someone" makes it seem like this has been going on for quite a while. She still cares deeply for his happiness,and the "someone" has this connotation of desperation.

"His only son/Cut down but the battle won/Oh,what is it worth/When all that's left is hurt"

I think the "son" is something special of his that he had to sacrifice in order to resolve whatever situation arose in the past. She's wondering if giving up whatever it was was worth it since it's left him in constant grief.

"Like the stars chase the sun/Over the glowing hill,I will conquer/Blood is running deep/Some things never sleep"

She's proclaiming that she will overcome his grief because he is important and close to her ("blood runs deep"),reiterating how this grief is relentless.

"Suddenly,I'm overcome/Dissolving like the setting sun/Like a boat into oblivion/'Cause you're driving me away"

She might not be strong enough to overcome his grief,as it overcomes her now. She's breaking down and can't help him because he drives her away with how he acts or what he says.

"Now you have me on the run/The damage is already done/Come on,is this what you want/'Cause you're driving me away"

They are really growing apart now,due to the things he's said or done to her. She still has a concern for him,wondering if the hurtful things he says are out of grief...or out of true feelings.

"Oh,the queen of peace/Always does her best to please/Is it any use/Somebody's gotta lose"

Trying to make him happy doesn't work and she's close to giving up. She's always the one to lose that battle.

"Like a long scream/Out there always echoing/Oh,what is it worth/When all that's left is hurt"

His grief is prominent in their relationship,and it's always in the background of their intimacy. In the last two lines,I think she's referring back to the second stanza AND also drawing attention to how their relationship is pain due to that scream.

"And my love is no good/Against the fortress that it made of you/Blood is running deep/Sorrow that you keep"

He can't be helped,at least not by her. His grief has made him so complicated that although she still cares for him,he is knowingly more attentive to his grief.

The last repeating stanzas imply that she will probably always be driven away until she finally ends the relationship. Despite the depressing theme though,the orchestra-like music is grand and amazing. :D

My Interpretation