Simplify the following text for a Grade 8 native English-speaking person.
Original: Pausanias ( Ancient Greek : PausanÃ as ) was a Greek traveler and geographer of the 2nd century AD , who lived in the times of Hadrian , Antoninus Pius and Marcus Aurelius .
Simplified: Pausanias ( Greek : ) was a Greek traveller and geographer of the 2nd century A.D. , who lived in the times of Hadrian , Antoninus Pius and Marcus Aurelius .