He continued his extensive travelling, visiting England, the Dutch Republic, Denmark, Berlin, Danzig, Courland, and other locations en route.

[12] The duke also attempted to get the Hanseatic towns of Greifswald and Stralsund to assume parts of his debts, triggering heavy conflicts.

[16] In 1622, Philipp Julius followed an invitation of Christian IV of Denmark and participated in an assembly (Kreistag) of the Lower Saxon Circle to explore a common financial strategy.

Between 1623[18] and 1625, the duke also negotiated with the Danish king the sale of Rügen to the latter in return for 150,000 Reichstalers, which only failed due to Bogislaw XIV's veto.

[19] The assembly was dominated by the Saxon electorate who had managed to prevent Brandenburg and Saxe-Weimar from participation,[20] furthermore the delegation of Anhalt departed in the course of the negotiations.

[20] It also claimed neutrality for the circle in the Thirty Years' War that at this time ravaged Bohemia, with the caveat of being able to switch to emperor Ferdinand II's side.

Continued dunning by the Saxon electorate in 1621, which had furthered her military position by successful campaigns in Silesia, led to a meeting of Pomeranian and Brandenburgian delegations at Prenzlau in 1622 to explore a possible alliance against John George.

Philipp Julius and Bogislaw XIV of Pomerania-Stettin were also willing to come to an agreement with the emperor, and accepted imperial monetary demands that they previously had rejected.

[28] Philipp Julius died only months before imperial forces occupied parts of the Upper Saxon circle,[29] on 6 February 1625.

[33] The residence in Wolgast decayed after Philipp Julius' death, was badly damaged during the Thirty Years' War, and, after 1798, most of the stone was scavenged and reused in other buildings.