Theodoric I, Margrave of Meissen
Theodoric I( 11 March 1162 – 18 January 1221), called the Oppressed(" Dietrich der Bedrängte"), was the Margrave of Meissen from 1198 until his death.
He was the second son of Otto II, Margrave of Meissen and Hedwig of Brandenburg.
Elisabeth of Meissen
Elisabeth of Meissen, Burgravine of Nuremberg( 22 November 1329 – 21 April 1375) was the daughter of Frederick II, Margrave of Meissen and Mathilde of Bavaria and a member of the House of Wettin.
Agnes of Meissen
Agnes of Meissen( born before 1264 – died after September 1332) was a noblewoman, the daughter of Albert II, Margrave of Meissen and his wife Margaret of Sicily.
Agnes was married with Henry I" the Marvelous" of Brunswick- Grubenhagen, in 1282.
They had 16 children:
Albert II, Margrave of Brandenburg
Albert II, Margrave of Brandenburg( – 25 February 1220) was a member of the House of Ascania.
He was Margrave of Brandenburg from 1205 until his death in 1220.
Albert II, Margrave of Meissen
Albert II, the Degenerate( de:" Albrecht II der Entartete")( 1240 – 20 November 1314) was a Margrave of Meissen, Landgrave of Thuringia and Count Palatine of Saxony.
He was a member of the House of Wettin.
He was the eldest son of Henry III, Margrave of Meissen by his first wife, Constantia of Austria.
Albert, Margrave of Meissen (1934–2012)
Prince Albert Joseph Maria Franz-Xaver of Saxony, Duke of Saxony, Margrave of Meissen (30 November 1934 – 6 October 2012) was the head of the Royal House of Saxony and a German historian.
The fourth child and youngest son of Friedrich Christian, Margrave of Meissen and his wife Princess Elisabeth Helene of Thurn and Taxis, he was the younger brother of Maria Emanuel, Margrave of Meissen, who was his predecessor as head of the Royal House of Saxony.
Frederick II, Margrave of Meissen
Frederick II, the Serious( 30 November 1310 in Gotha – 18 November 1349 at the Wartburg), Margrave of Meissen, son of Frederick I, Margrave of Meissen and Elisabeth von Lobdeburg- Arnshaugk.
Henry II, Margrave of Baden-Hachberg
Henry II, Margrave of Baden- Hachberg( before 1231 –) was the ruling Margrave of Baden- Hachberg from 1231 to 1289.
William II, Margrave of Meissen
Wilhelm II, the Rich (23 April 1371 – 13 March 1425) was the second son of Margrave Frederick "the Strict" of Meissen and Catherine of Henneberg.
Under the Division of Chemnitz of 1382, he received the Osterland and Landsberg jointly with his brothers, Frederick I, Elector of Saxony and George (d. 1402).
When Margrave William I "the one-eyed" died in 1407, William and Frederick also inherited a part of Meissen.
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, which Frederick had managed to obtain instead of Jena.
William fought at his brother's side in the Hussite war in Bohemia.
He is rumoured to have been married to Amelia of Mazovia.
According to Karlheinz Blaschke, however, he remained unmarried.
He died on 13 March 1425.
Catherine of Henneberg
Catherine of Henneberg (c. 1334, in Schleusingen – 15 July 1397, in Meissen) 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.
Via her, the House of Wettin inherited her father's Franconian possessions.

Question: When did William Ii, Margrave Of Meissen's mother die?
Answer: 15 July 1397