Short answers, pulled from the story.
Pomerania is a historical region on the southern shore of the Baltic Sea split between Poland and Germany. Its western boundary follows the Recknitz river, while the eastern edge stops at the Vistula River.
Settlement in the area called Pomerania began around 13,000 years ago after the end of the Vistula Glacial Stage. Various cultures left traces during the Stone and Bronze Age before West Slavic tribes and Vikings appeared during the Dark Ages.
Saint Otto of Bamberg converted the Duchy of Pomerania to Christianity in the 12th century. He is known as the Apostle of the Pomeranians.
With the extinction of the Griffin house, the Duchy of Pomerania was divided between the Swedish Empire and Brandenburg-Prussia in 1648. Pomerelia remained with the Kingdom of Poland until Prussia gained it later.
The Nazis deported Pomeranian Jews to a reservation near Lublin on the 12th of February 1940. More than 40,000 people died in executions, death camps, prisons, and forced labour during this period.
Kashubian dialects are spoken by the Kashubians in Pomerelia while Polish dominates the Polish part of Pomerania. Historical German dialects of Pomerania were Low German but Slovincian is now extinct.