Rotating Slavs, Germanics, and Romances

Using a POD of whenever, how could you get the Germanic peoples to occupy lands know known for Romance people, Romance people holding OTL Slavic lands, and Slavs inhabiting Germanic lands? Populations of other Indo-Europeans and Finno-Ugric peoples in unusual places is also encouraged.
 
Using a POD of whenever, how could you get the Germanic peoples to occupy lands know known for Romance people, Romance people holding OTL Slavic lands, and Slavs inhabiting Germanic lands? Populations of other Indo-Europeans and Finno-Ugric peoples in unusual places is also encouraged.
See any of Thermo's works...
 
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