These groups are identified as Celtic, Sarmatian, Scythian, Slavic, Baltic, and Germanic tribes.
However, the transition from paganism was not a smooth and instantaneous process for the rest of the population as evident from the pagan reaction of the 1030s.
Throughout the Iron Age it became extensively diverse, with various cultures and tribes settling in what was then East Germania.
The history of human activity on Polish soil spans almost 500,000 years.
This union formed the Polish-Lithuanian Commonwealth, one of the largest (1,000,000 square kilometres (390,000 sq mi)) and most populous countries of 16th and 17th century Europe, with a uniquely liberal political system which adopted Europe's first written national constitution, the Constitution of .
The Kingdom of Poland was founded in 1025, and in 1569 it cemented its longstanding political association with the Grand Duchy of Lithuania by signing the Union of Lublin.
Poland has a developed market and is a regional power in Central Europe, with the largest Stock Exchange in the East-Central European zone.