Whilst in this office, he founded the Hattparti or Hattar (‘Hat’ Party), which instigated the disastrous Russo-Swedish War (1741–1743), resulting in the loss of Kymmenegård. He was successively chancellor of the universities of Lund (1728) and Uppsala (1739), was a patron of letters and art, and wrote several poems and the first Swedish comedy, "Den svenska Sprätthöken" (1740). His "Letters . . . Relating to a Design to Raise a Rebellion on His Majesty's Dominions, to be Supported by a Force from Sweden", were published in French and English (1717).