principality of Opole Directory References Discover 7 Deadliest Weapons in History Poker Hands Ranked Spies Like Us: 10 Famous Names in the Espionage Game What Is the Emoluments Clause? Is Cinco de Mayo Mexico's Independence Day? 12 Novels Considered the “Greatest Book Ever Written” Timeline of the 2000s Contents principality of Opole historical state, Poland Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:capital at Opole In Opole…became the capital of the Opole principality, which included the entire Upper Silesia region. The town passed to Bohemia (1327), the Habsburgs (16th century), and Prussia (1742) and was returned to Poland in 1945. Read More