Biography of William Wittelsbach I Duke Lower Bavaria 1330-1389
Paternal Family Tree: Wittelsbach
Maternal Family Tree: Elizabeth Cuman
In 1308 [his father] Louis Wittelsbach IV Holy Roman Emperor (age 25) and Beatrix Świdnica Holy Roman Empress were married. She by marriage Holy Roman Empress. He the son of Louis "Strict" Wittelsbach II Duke Upper Bavaria and Matilda Habsburg Duchess Bavaria. He a great x 3 grandson of King Henry "Curtmantle" II of England. 
On 24 Aug 1313 Henry Luxemburg VII Holy Roman Emperor (age 38) died. He was buried at Pisa Duomo. His half fourth cousin [his father] Louis Wittelsbach IV Holy Roman Emperor (age 31) succeeded IV Holy Roman Emperor.
In 1324 [his father] Louis Wittelsbach IV Holy Roman Emperor (age 41) and [his mother] Margaret Hainault Holy Roman Empress (age 12) were married. She by marriage Holy Roman Empress. The difference in their ages was 29 years. She the daughter of William Hainault I Count Hainault III Count Avesnes III Count Holland II Count Zeeland (age 38) and Joan Valois Countess Zeeland Holland Avesnes and Hainault (age 30). He the son of Louis "Strict" Wittelsbach II Duke Upper Bavaria and Matilda Habsburg Duchess Bavaria. He a great x 3 grandson of King Henry "Curtmantle" II of England. She a great x 5 granddaughter of King Henry "Curtmantle" II of England. 
On 12 May 1330 William Wittelsbach I Duke Lower Bavaria was born to Louis Wittelsbach IV Holy Roman Emperor (age 48) and Margaret Hainault Holy Roman Empress (age 18).
In 1344 Ralph Stafford and [his future wife] Maud Plantagenet Duchess Lower Bavaria (age 4) were married. She the daughter of Henry of Grosmont 1st Duke Lancaster (age 34) and Isabel Beaumont Duchess Lancaster (age 24). He the son of Ralph Stafford 1st Earl Stafford (age 42) and Margaret Audley Countess Stafford (age 26). They were third cousin once removed. He a great x 2 grandson of King Edward "Longshanks" I of England. She a great x 2 granddaughter of King Henry III of England. 
In 1345 William Wittelsbach I Duke Lower Bavaria (age 14) succeeded V Count Holland.
On 26 Sep 1345 [his uncle] William Hainault II Count Hainault (age 38) died. His sister [his mother] Margaret Hainault Holy Roman Empress (age 33) succeeded II Countess Hainault. [his father] Louis Wittelsbach IV Holy Roman Emperor (age 63) by marriage Count Hainault.
In 1347 William Wittelsbach I Duke Lower Bavaria (age 16) succeeded I Duke Lower Bavaria.
On 11 Oct 1347 [his father] Louis Wittelsbach IV Holy Roman Emperor (age 65) died. His son [his half-brother] Stephen Wittelsbach II Duke Bavaria (age 28) succeeded II Duke Bavaria. Elisabeth Barcelona Duchess Bavaria (age 37) by marriage Duchess Bavaria.
In 1352 William Wittelsbach I Duke Lower Bavaria (age 21) and Maud Plantagenet Duchess Lower Bavaria (age 12) were married in London. She by marriage Duchess Lower Bavaria. He by marriage Earl of Leicester. She the daughter of Henry of Grosmont 1st Duke Lancaster (age 42) and Isabel Beaumont Duchess Lancaster (age 32). He the son of Louis Wittelsbach IV Holy Roman Emperor and Margaret Hainault Holy Roman Empress (age 40). He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great x 2 granddaughter of King Henry III of England.
In 1354 William Wittelsbach I Duke Lower Bavaria (age 23) succeeded V Count Hainault, V Count Zeeland.
In 1356 [his daughter] Unamed Wittelsbach was born to William Wittelsbach I Duke Lower Bavaria (age 25) and [his wife] Maud Plantagenet Duchess Lower Bavaria (age 16). She a great x 3 granddaughter of King Henry III of England.
In 1356 [his daughter] Unamed Wittelsbach died.
On 23 Mar 1361 [his father-in-law] Henry of Grosmont 1st Duke Lancaster (age 51) died at Leicester Castle [Map]. He was buried at Church of the Annunciation of our Lady of the Newark [Map].
Duke Lancaster, Earl Lincoln extinct.
[his sister-in-law] Blanche Plantagenet Duchess Lancaster (age 15) succeeded 5th Countess Lancaster and 2nd Countess Derby. John of Gaunt 1st Duke Lancaster (age 21) by marriage Earl Lancaster, Earl Derby.
[his wife] Maud Plantagenet Duchess Lower Bavaria (age 21) succeeded 5th Countess of Leicester.
On 10 Apr 1362 [his wife] Maud Plantagenet Duchess Lower Bavaria (age 23) died. Her sister [his sister-in-law] Blanche Plantagenet Duchess Lancaster (age 17) succeeded 6th Countess of Leicester. John of Gaunt 1st Duke Lancaster (age 22) by marriage Earl of Leicester adding a fourth Earldom to the ones he already held: Earl Richmond, Earl Lancaster and Earl Derby.
In 1369 [his mother] Margaret Hainault Holy Roman Empress (age 57) died.
On 15 Apr 1389 William Wittelsbach I Duke Lower Bavaria (age 58) died.
Kings Wessex: Great x 9 Grand Son of King Edmund "Ironside" I of England
Kings England: Great x 4 Grand Son of King Henry "Curtmantle" II of England
Kings Scotland: Great x 7 Grand Son of Malcolm III King Scotland
Kings Franks: Great x 6 Grand Son of Louis VII King Franks
Kings France: Great x 2 Grand Son of Philip "Bold" III King France
Great x 3 Grandfather: Otto Wittelsbach I Duke Bavaria
Great x 2 Grandfather: Louis Wittelsbach I Duke Bavaria
Great x 4 Grandfather: Louis Loon I Count Loon
Great x 3 Grandmother: Agnes Loon Duchess Bavaria
Great x 4 Grandmother: Agnes Metz Countess Loon
Great x 1 Grandfather: Otto "Illustrious" Wittelsbach II Duke Bavaria
Great x 3 Grandfather: Frederick Bohemia Duke Bohemia
Great x 2 Grandmother: Ludmilla Bohemia Duchess Bavaria
GrandFather: Louis "Strict" Wittelsbach II Duke Upper Bavaria 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry "Proud" Welf X Duke Bavaria
Great x 3 Grandfather: Henry "Lion" Welf XII Duke Saxony III Duke Bavaria
Great x 4 Grandmother: Gertrude Süpplingenburg Duchess Bavaria
Great x 2 Grandfather: Henry Welf V Count Palatine of the Rhine Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Henry "Curtmantle" II of England
Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Matilda Plantagenet Duchess Saxony Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Eleanor of Aquitaine Queen Consort Franks and England
Great x 1 Grandmother: Agnes Welf Duchess Bavaria Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Conrad Palatine Count Palatine
Great x 2 Grandmother: Agnes Palatine of the Rhine
Father: Louis Wittelsbach IV Holy Roman Emperor 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 1 Grandfather: Rudolph I King Romans
GrandMother: Matilda Habsburg Duchess Bavaria
Great x 2 Grandfather: Burkhard V Count Hohenberg
Great x 1 Grandmother: Gertrude Hohenburg
Great x 3 Grandfather: Rudolph II Count Palatine of Tubingen
Great x 2 Grandmother: Mathilda of Tubingen
William Wittelsbach I Duke Lower Bavaria 4 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: James Avesnes
Great x 3 Grandfather: Bouchard Avesnes
Great x 4 Grandmother: Adela Guise
Great x 2 Grandfather: John Hainault I Count Hainault 4 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Baldwin IX Count Flanders VI Count Hainault
Great x 3 Grandmother: Margaret II Countess Flanders 3 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Marie Blois Countess Flanders
2 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandfather: John Hainault II Count Hainault II Count Holland 5 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: William Gerulfing I Count Holland
Great x 3 Grandfather: Floris Gerulfing IV Count Holland
Great x 4 Grandmother: Adelaide Guelders Countess Holland
Great x 2 Grandmother: Adelaide Gerulfing Countess Hainault 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Henry Reginar VIII Duke Lower Lorraine I Duke Brabant
Great x 3 Grandmother: Mathilde Reginar Countess Holland and Palatine 3 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandmother: Maud Metz 2 x Great Grand Daughter of King William "Conqueror" I of England
GrandFather: William Hainault I Count Hainault III Count Avesnes III Count Holland II Count Zeeland 6 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandfather: Henry Luxemburg III Duke Limburg
Great x 3 Grandfather: Waleran Luxemburg III Duke Limburg
Great x 4 Grandmother: Sophia Saarbrücken Duchess Limburg
Great x 2 Grandfather: Henry "Great" Luxemburg V Count Luxemburg III Count Namur
Great x 4 Grandfather: Henry "Blind" Namur IV Count Luxemburg I Count Namur
Great x 3 Grandmother: Erminsende Namur Countess of Bar
Great x 4 Grandmother: Agnes Guelders Countess Namur and Luxemburg
Great x 1 Grandmother: Philippa Luxemburg Countess Hainault and Holland 5 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Theobald of Bar I Count of Bar 2 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: Henry of Bar II Count of Bar 3 x Great Grand Son of King William "Conqueror" I of England
Great x 4 Grandmother: Erminsende of Bar Sur Seine Countess Bar
Great x 2 Grandmother: Margaret of Bar Countess Luxemburg and Namur 4 x Great Grand Daughter of King William "Conqueror" I of England
Great x 4 Grandfather: Robert Capet II Count Dreux
Great x 3 Grandmother: Philippa Capet Countess of Bar
Great x 4 Grandmother: Yolande Coucy Countess Dreux
Mother: Margaret Hainault Holy Roman Empress 5 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Louis "Lion" VIII King France 3 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: King Louis IX of France Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Blanche Ivrea Queen Consort France
Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Philip "Bold" III King France 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Raymond Berenguer Provence IV Count Provence
Great x 3 Grandmother: Margaret Provence Queen Consort France
Great x 4 Grandmother: Beatrice Savoy Countess Provence
Great x 1 Grandfather: Charles Valois I Count Valois 3 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Peter II King Aragon
Great x 3 Grandfather: James I King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandmother: Isabella Barcelona Queen Consort France
Great x 4 Grandfather: King Andrew II of Hungary
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon
GrandMother: Joan Valois Countess Zeeland Holland Avesnes and Hainault 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Louis "Lion" VIII King France 3 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandfather: King Charles Capet of Sicily Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Blanche Ivrea Queen Consort France Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Charles II King Naples 2 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Raymond Berenguer Provence IV Count Provence
Great x 3 Grandmother: Beatrice Provence Queen Consort Sicily
Great x 4 Grandmother: Beatrice Savoy Countess Provence
Great x 1 Grandmother: Margaret Capet Countess Valois 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Béla IV King of Hungary
Great x 3 Grandfather: Stephen V of Hungary
Great x 2 Grandmother: Mary of Hungary Queen Consort Naples
Great x 3 Grandmother: Elizabeth Cuman