 After travelling back through Baghdad, Aleppo, Palestine and Egypt, he reached Venice in 1619 and returned to Sweden in 1620.On his return he entered royal service and was sent on a diplomatic mission to the Venetian Republic in 1621.During the 1620s, he followed King Gustavus Adolphus in the field, served under his cousin Governor-General Axel Oxenstierna in the Swedish administration in Prussia, e.g.