Sweden and Swedish Bremen-Verden protested sharply, when in December 1660 the city council of Bremen rendered homage to Leopold I, Holy Roman Emperor. In 1663, the city gained seat and vote in the Imperial Diet, strongly opposed by the representatives of the Swedish Duchies of Bremen and Verden therein. In March 1664, the Swedish Diet came out in favour of waging war on the Free Imperial City of Bremen. Right after, Leopold I, busy with wars against the Ottoman Empire, had enfeoffed the minor King Charles XI of Sweden with Bremen-Verden, and with the neighbouring Brunswick and Lunenburg (Celle line) being paralysed by succession quarrels and France being not opposed, Sweden started from its Bremen-Verden the Second Bremian War (1665–1666).