Wilhelm II, the Rich was the second son of Margrave Frederick the Strict of Meissen and Catherine of Henneberg

Catherine of Henneberg

Catherine of Henneberg was a Countess of Henneberg by birth and from 1347 by marriage Margravine of Meissen, Landgravine of Thuringia, etc. She was the wife of Margrave Frederick the Severe of Meissen...

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Under the Division of Chemnitz

Division of Chemnitz

The Division of Chemnitz settled the succession in the Landgraviate of Thuringia.After the death of Frederick the Severe, Margrave of Meissen and Landgrave of Thuringia, the five heirs of the House of Wettin decided to divide the country...

 of 1382, he received the Osterland

Osterland

Osterland is a historical region in Germany. It was situated between the Elbe and Saale rivers to the north of Pleissnerland which it later absorbed and it included the city of Leipzig...

 and Landsberg jointly with his brothers, Frederick I, Elector of Saxony

Frederick I, Elector of Saxony

Frederick IV of Meissen and Elector of Saxony was Margrave of Meissen and Elector of Saxony from 1381 until his death. He is not to be confused with his cousin Frederick IV, Landgrave of Thuringia, the son of Balthasar, Landgrave of Thuringia...

 and George (d. 1402). When Margrave William I "the one-eyed"

William I, Margrave of Meissen

William I, the one-eyed, was Margrave of Meissen. His surname is related to the legend that Saint Benno appeared to him because of his disputes with the Church in a dream and he had an eye gouged out.- Life :William was the son of Frederick II, Margrave of Meissen and Mathilde of Bavaria...

 died in 1407, William and Frederick also inherited a part of Meissen

Meissen

Meissen is a town of approximately 30,000 about northwest of Dresden on both banks of the Elbe river in the Free State of Saxony, in eastern Germany. Meissen is the home of Meissen porcelain, the Albrechtsburg castle, the Gothic Meissen Cathedral and the Meissen Frauenkirche...

. Under the 1410 Treaty of Naumburg, however, the brothers agreed to a fresh division of the Meissen territory. They agreed to divide the Osterland between themselves. They did so in 1411; William received the larger part of the Osterland, including Leipzig

Leipzig

Leipzig Leipzig has always been a trade city, situated during the time of the Holy Roman Empire at the intersection of the Via Regia and Via Imperii, two important trade routes. At one time, Leipzig was one of the major European centres of learning and culture in fields such as music and publishing...

, which Frederick had managed to obtain instead of Jena

Jena

Jena is a university city in central Germany on the river Saale. It has a population of approx. 103,000 and is the second largest city in the federal state of Thuringia, after Erfurt.-History:Jena was first mentioned in an 1182 document...

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William fought at his brother's side in the Hussite

Hussite

The Hussites were a Christian movement following the teachings of Czech reformer Jan Hus , who became one of the forerunners of the Protestant Reformation...

 war in Bohemia

Bohemia

Bohemia is a historical region in central Europe, occupying the western two-thirds of the traditional Czech Lands. It is located in the contemporary Czech Republic with its capital in Prague...

. He is rumoured to have been married to Amelia of Mazovia. According to Karlheinz Blaschke, however, he remained unmarried.

He died on 30 March 1425.