Duchy of Silesia in the context of "Henryk IV Probus"

Wrocław (Polish: [ˈvrɔt͡swaf] ; German: Breslau [ˈbʁɛslaʊ] ; also known by other names) is a city in southwestern Poland, and the capital of the Lower Silesian Voivodeship. It is the largest city and historical capital of the region of Silesia. It lies on the banks of the Oder River in the Silesian Lowlands of Central Europe, roughly 40 kilometres (25 mi) to the north of the Sudetic Mountains. In 2023, the official population of Wrocław was 674,132, making it the third-largest city in Poland. The population of the Wrocław metropolitan area is around 1.25 million.

Wrocław is the historical capital of Silesia and Lower Silesia. The history of the city dates back over 1,000 years; throughout history it has been part of, chronologically: the Duchy of Poland, the Kingdom of Poland, the Duchy of Silesia, the Kingdom of Bohemia, the Kingdom of Hungary, the Habsburg monarchy of Austria, the Kingdom of Prussia and Germany, until it became again part of Poland in 1945 immediately after World War II.

The Duchies of Silesia were the more than twenty divisions of the region of Silesia formed between the 12th and 14th centuries by the breakup of the Duchy of Silesia, then part of the Kingdom of Poland. In 1335, the duchies were ceded to the Kingdom of Bohemia under the Treaty of Trentschin. Thereafter until 1742, Silesia was one of the Bohemian crown lands and lay within the Holy Roman Empire. Most of Silesia was annexed by the King of Prussia under the Treaty of Berlin in 1742. Only the Duchy of Teschen, the Duchy of Troppau and the Duchy of Nysa remained under the control of the Bohemian crown and as such were known as the Duchy of Upper and Lower Silesia until 1918.

The Principality of Opava (Czech: Opavské knížectví; Polish: Księstwo Opawskie) or Duchy of Troppau (German: Herzogtum Troppau) was a historic territory split off from the Margraviate of Moravia before 1269 by King Ottokar II of Bohemia to provide for his natural son, Nicholas I. The Opava territory thus had not been part of the original Polish Duchy of Silesia in 1138, and was first ruled by an illegitimate offshoot of the Bohemian Přemyslid dynasty, not by the Silesian Piasts like many of the neighbouring Silesian duchies. Its capital was Opava (Troppau) in the modern-day Czech Republic.

From 1337 onwards, the Přemyslid dukes also ruled the adjacent former Piast Duchy of Racibórz, whereupon Opava became united with the Upper Silesian lands. When the Opava branch became extinct in 1464, it fell back to the Bohemian Crown, from 1526 part of the Habsburg monarchy. In the final three centuries of its existence, the duchy was ruled by the House of Liechtenstein. It was dissolved with the Austro-Hungarian Empire in 1918, but the title of Duke of Troppau and Jägerndorf still exists, belonging to a present-day monarch, Prince Hans-Adam II of Liechtenstein. The Duchy of Jägerndorf (Krnov) was another of the Silesian duchies.

The Silesian Piasts were the elder of four lines of the Polish Piast dynasty beginning with Władysław II the Exile (1105–1159), eldest son of Duke Bolesław III of Poland. By Bolesław's testament, Władysław was granted Silesia as his hereditary province and also the Lesser Polish Seniorate Province at Kraków according to the principle of agnatic seniority.

The Battle of Legnica (Polish: bitwa pod Legnicą), also known as the Battle of Liegnitz (German: Schlacht von Liegnitz) or Battle of Wahlstatt (German: Schlacht bei Wahlstatt), was fought between the Mongol Empire and combined European forces at the village of Legnickie Pole (Wahlstatt), approximately 10 kilometres (6 mi) southeast of the city of Legnica in the Duchy of Silesia on 9 April 1241.

A combined force of Poles and Moravians under the command of Duke Henry II the Pious of Silesia, supported by feudal nobility and a few knights from military orders sent by Pope Gregory IX, attempted to halt the Mongol invasion of Poland. The battle took place two days before the Mongol victory over the Hungarians at the much larger Battle of Mohi.

Wrocław (Polish: [ˈvrɔt͡swaf] ; German: Breslau [ˈbʁɛslaʊ] ; also known by other names) is a city in southwestern Poland, and the capital of the Lower Silesian Voivodeship. It is the largest city and historical capital of the region of Silesia. It lies on the banks of the Oder River in the Silesian Lowlands of Central Europe, roughly 40 kilometres (25 mi) to the north of the Sudetic Mountains. In 2025, the official population of Wrocław was 672,545, making it the third-largest city in Poland. The population of the Wrocław metropolitan area is around 1.25 million.

Wrocław is the historical capital of Silesia and Lower Silesia. The history of the city dates back over 1,000 years; throughout history it has been part of, chronologically: the Duchy of Poland, the Kingdom of Poland, the Duchy of Silesia, the Kingdom of Bohemia, the Kingdom of Hungary, the Habsburg monarchy of Austria, the Kingdom of Prussia and Germany, until it became again part of Poland in 1945 immediately after World War II.

The Treaty of Trentschin was concluded on 24 August 1335 between King Casimir III of Poland and King John of Bohemia together with his son Margrave Charles IV. The agreement was reached by the agency of Casimir's brother-in-law King Charles I of Hungary and signed at Trentschin Castle in the Kingdom of Hungary (present-day Trenčín, Slovakia). It initiated the transfer of suzerainty over the former Polish province of Silesia to the Kingdom of Bohemia, whereafter the Duchies of Silesia were incorporated into the Bohemian Crown and thus became part of the Holy Roman Empire. Following the integration of this treaty, the three kingdoms of Bohemia, Hungary, and Poland met at the First Congress of Visegrad later in 1335 to further discuss the division of land. This congress also made the treaty official.