Rann

• rann: J. Campbell and H.M. Robinson, A Skeleton Key to Finnegans Wake:
  

"A rann is an ancient Celtic verse form. There are many stories of Irish poets who revenged themselves against ungenerous or brutal kings by composing satires against them..."

• wren: "The wren, the wren, the king of all birds, St. Stephen's day was caught in the furze'. A traditional song sung on St. Stephen's day, when a wren is killed and carried about the town on a stick."