I would say the Hittites and the Celts. The Hittites thrived and disbanded before the beginnings of the Roman empire. The Celts were absorbed by the Romans but were keen to follow their ways.
1 Germany lost land, the Ottoman Empire was dissolved and Russia lost some land. 2 Ottoman Empire and Germany. Well the Ottoman empire was destroyed and Germany was forced to give it up.
Osman I, he founded the Ottoman empire
Fur elise, piano sonata number 8 and 14 (Beethoven)
The new environment allowed for an exchange of new foods like corn. Crops that were grown the Americas and vice versa were able to be shared between two cultures.