Casimir V was the youngest son of Duke Swantibor III of (1351–1413), who ruled Pomerania-Stettin alone. His father made him leader of the Pomeranian contingent who took part in the Battle of Tannenberg (1410) on the side of the Teutonic Order.
After 1428, he ruled Pomerania-Stettin alone. He was released soon afterwards. The war with Brandenburg continued.
In 1415, Elector Frederick I of Brandenburg convinced King Sigismund to outlaw Otto II and Casimir V. He also called the imperial immediacy of Pomerania in question.
In 1417, Sigismund enfeoffed Otto and Casimir, but this was conditional on any rights Brandenburg might have on Pomerania. In 1424, Casimir visited Sigismund in Buda in Hungary.
Otto and Casimir were then enfeoffed unconditionally. After Otto II died childless in 1428, Casimir ruled Pomerania-Stettin alone.
He suppressed a revolt in the city of Szczecin.
He ordered the execution of the ringleaders, the city had to pay a steep fine and resign from the Hanseatic League. Casimir V died in 1435 and was buried in the Otten Church in Stettin. The counting of the rulers of the House of Griffins has always been complicated.
From time immemorial there exists an imbalance, which causes some confusion.
Under that system, the subject of this article is Casimir V. If one also takes into account cadet branch of the Swantiborides, which was common in the older literature, he would be Casimir VI.
The modern numbering counts only the members of the main line of the House of Griffins.
