Around 1328 [her father] Henry of Grosmont 1st Duke Lancaster (age 18) and [her mother] Isabel Beaumont Duchess Lancaster (age 8) were married. She the daughter of [her grandfather] Henry Beaumont Earl Buchan (age 49) and [her grandmother] Alice Comyn Baroness Beaumont. He the son of [her grandfather] Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 47) and [her grandmother] Maud Chaworth. They were fourth cousins. He a great grandson of King Henry III of England. She a great x 4 granddaughter of King Henry I "Beauclerc" England.

On or before 04 Apr 1340 Maud Plantagenet Duchess Lower Bavaria was born to Henry of Grosmont 1st Duke Lancaster (age 30) and Isabel Beaumont Duchess Lancaster (age 20) at Bolingbroke Castle, Lincolnshire [Map]. The exact date of her birth uncertain. The Inquisition of her father in May 1361 refers to Blanche being "Maud lady of Henaud [Hainault], aged 21 years on the feast of St. Ambrose last". The Feast of the Ambrose being the 4th of April so Maud was born on or before the 4th of April 1340. She a great x 2 granddaughter of King Henry III of England.

In 1344 Ralph Stafford and Maud Plantagenet Duchess Lower Bavaria (age 3) 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 I of England. She a great x 2 granddaughter of King Henry III of England.

In 1347 [her husband] Ralph Stafford died.

In 1352 William Wittelsbach I Duke Lower Bavaria (age 21) and Maud Plantagenet Duchess Lower Bavaria (age 11) 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.

After 19 Jul 1353 [her brother-in-law] Albert Wittelsbach I Duke Bavaria (age 16) and Margaret Silesia were married. He the son of Louis Wittelsbach IV Holy Roman Emperor and [her mother-in-law] Margaret Hainault Holy Roman Empress (age 41). He a great x 4 grandson of King Henry "Curtmantle" II of England.

In 1356 [her daughter] Unamed Wittelsbach was born to [her husband] William Wittelsbach I Duke Lower Bavaria (age 25) and Maud Plantagenet Duchess Lower Bavaria (age 15). She a great x 3 granddaughter of King Henry III of England.

Inquisitions Post Mortem 118. Writ, 25 March, 35 Edward III. Derby. Inq. taken at Melbum, 4 May, 35 Edward III.

Melbum. The castle and manor (extent given), held of the king in chief by service of a barony. The following field and place names occiu- in the extent : — le Oxlesewe, le Heye, le Bencheparrok, Trentford, le Feldyngbrugge, Russhegrenes, le Hok by Littehnedewebrok, le Hallefeld, Carreweye, le Oldefisshepol, Shallohed and Hervestwellefield. A custom called ' thisteltak ' is payable at Michaelmas. The duke gave to Ingram Fauconer, constable of Melbum castle, a yearly rent of £10. for life, to Amice wife of the said Ingram 5 marks yearly for life, to be increased to 10 marks after her husband's death should she survive him, to John le Fauconer 5 marks for life, to Ahce late the wife of Thomas le Beek a pasture called ' Thomyholm ' for life, and to William le Synger of Weston a pasture called 'le Hassokes' with 'le Puttes' for life. There is a custom called 'tolpottes.'

He held no other lands in the county and no knights' fees or advowsons of churches.

He died on Tuesday before Easter last. His daughters Maud (age 20) lady of Henaud, aged 21 years on the feast of St. Ambrose last, and [her sister] Blanche (age 18), lady of Richmond, aged 19 years at the feast of the Annunciation last, are his heirs.

In 1361 [her mother] Isabel Beaumont Duchess Lancaster (age 41) died.

On 18 Sep 1361 [her brother-in-law] Louis "The Brandenburger" Wittelsbach V Duke Bavaria (age 45) died.

On 10 Apr 1362 Maud Plantagenet Duchess Lower Bavaria (age 22) died. Her sister [her sister] Blanche Duchess of Lancaster (age 20) 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.

On 15 Apr 1389 [her former husband] William Wittelsbach I Duke Lower Bavaria (age 58) died.