OK, the celts seemed to rule from the british isles to hungary. In 400 BC they displaced the romans (the Etruscans were another euro-ancester, in italy from elsewhere) from around the Po. The roman empire fought back.
There was the ottoman empire and the mongol kingdoms (Merkits, the Keraits, the Khitai, the Naimans, the Qaidu, and the Tatars) later in eurasia's history.
We can't forget the moors
The Moors were a nomadic people from North Africa; originally they were the inhabitants of Mauretania. They invaded Spain, taking their Islamic religion and culture with them, in 711, where they overran the Visigoths. They spread northward across the Pyrenees into France, but they were turned back by Charles Martel and his Frankish knights in 732.