 Nyora kupfuurira kweiyi ndima - Thelning akaberekerwa muVästergötland, uye akadzidza paRoyal Swedish Academy of Arts, pamwe naCarl Gustaf Pilo naLouis Jean Desprez. Akatamira kuHelsinki muna 1798 ndokugara muLaajasalo. Akadhirowa mifananidzo yezvinhu zvechitendero uye mifananidzo yeatari dzechechi pamwe chete nemifananidzo. Akanga ariwo mufananidzo wokutanga wenyika yomunzvimbomo yeKangasala. Thelning akapenda altarpiece yechechi yeVihti 1798, Diet Balls 1809, uye The Opening of the Diet of Porvoo1812 iro rinoonekwa sebasa guru raThelning. Akapendawo mufananidzo waJohan Sederholm, uyo ndeweHelsinki City Art Museums muunganidzwa. Akatamira kuSt. Petersburg muna 1820, uko hurumende yaibhadhara 600 rubles pension yegore negore nokuda kwemifananidzo yake yeDiet of Porvoo. Chidimbu chacho haana kuzvitengesa, asi chirikadzi yake yakatengesa, uye zvino chiri muHofisi yeDhiocese yePorvoo. Akafira muSaint Petersburg, ava nemakore 64. 