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In page Balts:

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Over time the Balts became differentiated into West and East Balts. In the fifth century AD parts of the eastern Baltic coast began to be settled by the ancestors of the Western Balts: Brus/Prūsa ("Old Prussians"), Sudovians/Jotvingians, Scalvians, Nadruvians, and Curonians. The East Balts, including the hypothesised Dniepr Balts, were living in modern-day Belarus, Ukraine and Russia.[citation needed]