Not much is known about the past of this ancient vampire, but Eric ruled Gaul alongside his broodmate Antonius, before the Romans invaded their lands.
Most likely after his brother departed to Constantinople, he traveled north and became the first known Cainite to reside in the area of modern Berlin - which was very sparsely populated in the Dark Medieval era.
His open rule of the land ended in 1140, when Eric was hunted down and badly wounded by Karl Schrekt - who was still mortal, a demon hunter from Vienna. He's been in torpor under Berlin since then, influencing events in the city - and might be responsible for the Ventrue rule over that city.
Since Gustavs demise, the banishing of Wilhelm the title of Prince (VTM) has been given to the Malkavian (VTM) Abraham Wolff. Erik is quite displeased with the absense of a Blue blood on the throne and as Erik stirs the Kindred of Berlin is haunted by images of destruction.
France by night
According to the v20 Dark Ages book France by Night, published by Arkhane Asylum Publishing, Erik Eigermann's original name was Ueruic, which means "Grand Combatant". It says Antonius and he arrived in Gaul around the time of the founding of Massalia (modern day Marseilles) by the Greeks. They quickly established themselves among the Edu people which they ruled over. However once Antiorix came to side with Rome and met his lover Beshter, Erik left for Germany.