Mezue nkebi ahịrịokwu a: Mgbe ọ bụ nwata, a zụlitere ya n'obí eze Sweden n'akụkụ nwa nwanne nne ya bụ́ Eze Nwanyị Christina, a kụziiri ya ihe nke ọma. Ka oge na-aga, Charles nke Iri mụtara nkà agha n'aka Lennart Torstenson, ebe ọ nọ na Agha nke Abụọ nke Breitenfeld (1642) na na
Jankowitz (1645). Site na 1646 ruo 1648 ọ gara n'ụlọ ikpe ndị Sweden, nke a na-ekwu na ọ ga-abụ di nke nwa nwanne ya nwanyị bụ eze nwanyị na-achị achị, Christina nke Sweden (1626-89, chịrị 1632-54), mana mmegide ya na-enweghị ike ịlụ di na nwunye kwụsịrị atụmanya ndị a, na iji kwụọ nwa nwanne ya nwoke ụgwọ maka nkwa ọkara agbajiri, o kwupụtara ya onye ga-anọchi ya na 1649, n'agbanyeghị mmegide nke Privy Council nke Axel Oxenstierna na-edu. N'afọ 1648, a họpụtara ya ịbụ ọchịagha nke ndị agha Sweden nọ na Germany. Mmechi nke nkwekọrịta nke Westphalia n'October 1648 gbochiri ya inweta ihe nrite ndị agha nke a sịrị na ọ chọrọ, ma dị ka onye nnọchianya Sweden n'ọgbakọ ndị isi nke Nuremberg, o nwere ohere ịmụta diplomacy, sayensị nke a kọwara dị ka onye ji ngwa ngwa mee ihe. Dị ka onye nketa a ma ama nke ocheeze ahụ, ọnọdụ ya mgbe ọ laghachiri Sweden dị ize ndụ n'ihi enweghị afọ ojuju na-arịwanye elu na eze nwanyị ahụ. Ya mere ọ lara azụ n'àgwàetiti Öland ruo mgbe nkwụsị nke Christina na 5 June 1654 kpọrọ ya n'ocheeze.