The younger period of the Iron Age is called La Tène culture. The name comes from the place La Tene in Switzerland, where the settlement with characteristic findings for this epoch was discovered. We divide it into three sub-periods - older, middle and younger. During the first two - the Pomeranian culture developed without more sudden changes. In the last one which is often called late-La Tène culture or pre-Roman (125 B.C.÷0) and within a Roman period (0÷375 AD) fundamental changes in the social, economical and cultural sphere occurred. These changes didn't have a character of fundamental ethnical transformations. The changes took place within the same groups on the basis of native Lusatian and Pomeranian cultures.

As the consequence of those changes, at the beginning of 2th century B.C. a new culture of early-Slavonian tribes on grounds of Middle Pomerania appeared - the culture of cavitary graves. This tribe was called this way from the predominant in this period, forms of graves. In those graves the all remainder of the crematory funeral pyre was submitted to the cave in the ground without the protected cinerary urn. This culture is also called Baltic Veneti. This name comes from first historic notices in ancient documents (Plinius, Tacitus, Ptolemaeus) which were defining nations inhabiting the grounds situated over Baltic Sea and lower Vistula with the name Vistula Veneti.

In the context of cavitary graves cultures we distinguish the so-called population of the Oksywie and the Przeworsk. The first group lived on the terrains among Baltic Sea and the Moraine Baltic. The second group inhabited the Chelmno terrains and south part of Pomerania. A basis of economy for both groups was agriculture, shepherding, hunting and fishing. The Oksywie group had developed, however, skills related to melting of iron, especially within the sphere of manufacture of tools and weapons. Those skills definitely distinguished this group from the Przeworsk group. The early metallurgy and the blacksmithing were based on rich deposits of mentioned morass ore. The differentiation in the posthumous equipment of graves with the weapons, tools and ornaments also pays attention (it was common for both groups). It clearly shows that in this period the financial stratification in the society started to appear. In the mentioned above historical period population of the Oksywie group mixed with the immigrant Germanic population (from Scandinavia) lived in Middle Pomerania. In the initial period the tribes of Goths and later Gepidae inhabited our terrains. In the picture you can see the visible grave of the Gothic "princess" taken from the archaeological site on the cemetery in Kowalewko.

Despite the mentioned ethnical changes the later domination of autochthons from the Oksywie group does not raise doubts. The main proof of this thesis is the universally preserved funeral inhumation ceremonial, i.e. cremation and the composition of remains in cavitary graves or in cinerary urns. By the action of trade contacts with representatives of the ancient world culture the specialization of craftsmen, especially in metallurgy or to ceramics was formed. A basis of existence of wide groups of the contemporary society was still agriculturally - cultivation economy.

Within the Roman period (0-375 AD) after the breakdown of the Celtic empire by Romans, Polish terrains together with Middle Pomerania got into the reach of Rome influences, becoming one of Roman provinces. As a result of establishing trade relations the flow in merchandising from the South of Europe on our terrains began. The goods were often imported by Roman merchants, who were arriving to our terrains in order to find precious amber. The most important goods were bronze dishes: kettles, buckets etc. The merchants reached on Pomeranian terrains with the way called the Amber Route. It was conducted from Italy through the areas of the middle Danube River, the Moravian Gate, Silesia and Great Poland. One of more precious findings in Slupsk from this period are the glass beads and the bronze pitcher with the richly ornamented handle. On the area of today's city, silver, Roman coins with images of emperors: Augustus, Domitian, Hadrian, Nero and also Octavian (23 B.C. - 138 AD) were also found.

A next phase in most ancient history of Pomerania inhabitants is the so called migration of nations’ period (375÷570 AD). At that time many ethnical and settlement changes occurred on our terrains. The migration of Veleti from over the Vistula delta to the Oder River had taken place. The Obodrite from over the Oder River migrated on today's Mecklenburg terrains. Despite mentioned shifts, the majority of Veneti people stayed on Pomerania terrains (today’s old Slupsk terrains). One of the proofs of continuity of the population of those terrains, from Roman period to the early Middle Ages, is among other things saving the Slavic name for the Vistula River. The main effect of the migration of nations was a breakdown in trade contacts with the Roman Empire. This fact had a negative influence on the development of arts and crafts on the terrains of Pomerania for next years.