Who was the emperor who wrote mediations and allowed Germans to settle on the frontiers of rome?

Answer 1

I guess that by mediations you mean meditations. Marcus Aurelius (reigned 161-180) was also a stoic philosopher and wrote a book called Meditations in Greek. It dealt with stoic themes such as the preservation equanimity in the midst of conflict and the need to follow nature for guidance. It is still considered an important philosophical work. Marcus Aurelius was nicknamed "the philosopher." However, he did not allow Germanic peoples to settle in the Roman Empire. He spent 14 years of his reign fighting against invasions of the empire from across the river Danube by Germanic peoples. He fought and won the Marcomannic Wars and wanted to invade Bohemia (modern Check Republic) to subdue the Marcomanni, one of these gremanic peoples.

The emperor who allowed a Germanic people (the Visigoths) to settle in the Roman Empire (in the lower Danube area) was Valens. That was much later in history, in 376.

Also note that the Germans did not exist in antiquity. The term which is used is Germanic peoples. Germanic is a language group which includes German, Dutch, Danish, Norwegian, Swedish and English. The Germanic peoples of antiquity were the ancestors of the people who now speak these modern languages and came from the mentioned areas. In that period there were migrating from northern Europe to central and eastern Europe.

Answer 2

Marcus Aurelius.