Duke Swantibor I was a son of Barnim III, nicknamed the church founder (born: c. 1303; died: 1368), who ruled in the Teilherzogtum of Pomerania-Stettin.
He was faced with the challenge to maintain the position of Pomerania, which was splintered into several Teilherzogtumer, against its neighbours, in particular, against Brandenburg.
The Dukes had conflicts with the Pomeranian cities and were short of funds due to their ongoing feuds.
In 1403, however, Swantibor tried to make his son Otto II archbishop of Riga, against the will of the Order, who supported John of Wallenrode as their candidate for the position.
In the Battle of Grunwald in 1410, a Pomeranian contingent led by Swantibor's son Casimir V, fought on the side of the Order.
Swantibor then fell into disputes with the local nobility in Beeskow, who had previously supported him against Jobst.
The verdict of the historian Martin Wehrmann (1861–1937) was the Duke Swantibor seems to have been an energetic and capable ruler, who was unfortunately, due to the condition of his country, unable to achieve permanent results.