 The royal dynasty, however, had a stabilizing effect on Poland's politics.The Jagiellonian Era is often regarded as a period of maximum political power, great prosperity, and in its later stage, a Golden Age of Polish culture.The feudal rent system prevalent in the 13th and 14th centuries, under which each estate had well defined rights and obligations, degenerated around the 15th century as the nobility tightened their control over manufacturing, trade and other economic activities.