The Eastern Roman Emperor Justinian for a time retook and restored much of the territory once held by the unified Roman Empire, from Spain and Italy, to Anatolia. Unlike the Western Roman Empire, which met a famous if rather ill-defined death in the year 476 AD, the Eastern Roman Empire came to a much less famous but far more definitive conclusion at the hands of Mehmet II and the Ottoman Empire in the year 1453. Its expert military and diplomatic power ensured inadvertently that Western Europe remained safe from many of the more devastating invasions from eastern peoples, at a time when the still new and fragile Western Christian kingdoms might have had difficulty containing it.