Background
He was the son of Bogislaw V, brother of Casimir IV and Bogislaw VIII.
He was the son of Bogislaw V, brother of Casimir IV and Bogislaw VIII.
In 1386 he allied himself with the Knights, but in 1390, in Pyzdry, he allied himself with Poland, and pledged vassalage to king of Poland, Władysław Jagiełło. In return, he received the territory of Nakło from the Polish king. In 1392–1393 he went on a pilgrimage to the Holy Land.
According to some sources, the pilgrimage started already in 1391, yet he is also reported to have stayed in Vordingborg in July 1392. Bogislaw returned to Pomerania, and Wartislaw travelled southwards to meet with Wartislaw VIII, Duke of Pomerania. Both Wartislaws then travelled through Hungary.
In Smederevo, a town southeast of Belgrad (then part of Hungary, now part of Serbia) Wartislaw VII fell ill, and in 1393 returned to Pomerania while Wartislaw VIII continued the pilgrimage alone. During Wartislaw VII's absence, the Pomeranian noble Matzke von Borcke auf Stramehl had led a holdup in Pomerania-Stolp, where Bohemian komtur Johann von Mühlheim was robbed on his way to the Teutonic Order state in late 1392. Wartislaw and Bogislaw then granted him permission to destroy Matzke's residence Stramehl, which eventually was razed.
Wartislaw died between November 1394 and 23 February 1395.
He maneuvered between two local powers, the Teutonic Knights and the Kingdom of Poland. Konrad von Wallenrode, Grand Master of the Teutonic Knights, protested at Wartislaw VII's and Bogislaw VIII's court and demanded satisfaction.