What is "selencia"

__NOTOC__Selencia was an early 12th-century entity at or near the southern coast of the Baltic Sea, mentioned only in the chronicles of Gallus Anonymus, who listed it as one of three northern neighbors of Piast Poland around 1115 (the other ones being " Pomorania" and " Pruzia." It has been proposed that Selencia was a misspelling of Luticia, or that Selencia was a short-lived state centered on the Oder estuary, probably destroyed when in 1122 Boleslaw III Wrymouth of Poland defeated, according to the annals of Cracow, a "Zuetopolc dux Odrensis."