Lyric discussion by LadyZephyrus 

Ignore the title. "Souverian" is just a pretty French word Mr. Bird liked. He was asked about it in an NPR interview just before the album release.

Host: I don't know if I'm saying this right, Sou- Bird: "Souverian," yeah. It's French. Host: Oh, what's it mean? Bird: I do not know.

You know him, he'll use random words even if they don't add to the theme or message.

BTW, for the curious, "souverian" means being powerful or having control.

Haha, that definitely makes sense. But in the context of the song, it still seems to be used as a name ("Souverian the elder" "Souverian was free").

It could be about Cuthulu and Innsmouth on the shore... Mayhap he is a fan of HP Lovecraft.

Or it could about acts of Hubris, the river Styx, and bending the branches down could be about Tantalus being stuck in Hades being unable to reach the fruit and water...

BTW--he seems to have morphed the lyrics from the 1st stanza lately into: "The church steeples pushing higher" instead of the printed lyrics of catching fire.

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