High Quality Content by WIKIPEDIA articles! The ancient Roman scholars new nothing about the impenetrable forest north of Dacia and the Carpathian Mountains, between the migrating Celts and Germanic tribes to the west, and the Sarmatians to the east. Augustian historian Strabo only assumed the presence of a different tribe reaching north to the Baltic Sea. Strabo and Tacitus (who introduced the concept of Germanorum in the 1st century) admitted to knowning nothing more.