Analysis of information sources in references of the Wikipedia article "Igreja Ortodoxa Finlandesa" in Portuguese language version.
[...] [William of Sabina] [...] in 1237, as the agent of Gregory IX, [...] began organizing a crusade of Latin powers against Novgorod. [...] [I]t was not until 1240 that Gregory's crusade got under way, with the Swedish raid up the Neva and the conquest of Izborsk and Pskov by the Danes and the Teutonic Order [...].
