I have a theory:
There's this line that goes: "All along the watchtower, princes kept the view." Right?
Well let us look at the watchtower. There is only one piece remotely close to the watchtower on a7: the pawn on b6. So this must then be a prince. However, we know that this pawn can promote to a queen, but not to a king. This leads me to the conclusion that the pawn is in fact a princess, not a prince; the line would then go: "all along the watchtower, princess kept the view." This makes even more sense when we remind ourselves that there is only one pawn around, so "princes" is impossible in this position.
There can be a debate whether the princess is just a princess or is actually called "Princess", but this is something I will think about tomorrow.