After 1305 Thomas Wake 2nd Baron Wake of Liddell (age 8) and [her future sister-in-law] Blanche Plantagenet Baroness Wake Liddell were married. She by marriage Baroness Wake of Liddell. She the daughter of Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 24) and Maud Chaworth (age 22). They were half third cousin once removed. He a great x 3 grandson of King John "Lackland" of England. She a great granddaughter of King Henry III of England.

Before 14 Jul 1310 [her father] Henry Beaumont Earl Buchan (age 31) and [her mother] Alice Comyn Baroness Beaumont were married. She by marriage Baroness Beaumont. He by marriage Earl Buchan. He a great x 3 grandson of King Henry I "Beauclerc" England.

Around 1328 Henry of Grosmont 1st Duke Lancaster (age 18) and Isabel Beaumont Duchess Lancaster (age 8) were married. She the daughter of Henry Beaumont Earl Buchan (age 49) and Alice Comyn Baroness Beaumont. He the son of Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 47) and 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.

Before 24 Jun 1340 John Mowbray 3rd Baron Mowbray (age 29) and [her sister-in-law] Joan Plantagenet Baroness Mowbray (age 28) were married. She by marriage Baroness Mowbray. She the daughter of Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 59) and Maud Chaworth. He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great granddaughter of King Henry III of England.

Before 10 Nov 1341 Henry Percy 11th and 3rd Baron Percy (age 20) and [her sister-in-law] Mary Plantagenet Baroness Percy (age 21) were married. She by marriage Baroness Percy of Alnwick. She the daughter of Henry Plantagenet 3rd Earl of Leicester 3rd Earl Lancaster (age 60) and Maud Chaworth. They were half third cousin once removed. He a great x 5 grandson of King Henry "Curtmantle" II of England. She a great granddaughter of King Henry III of England.

In 1344 [her son-in-law] Ralph Stafford and [her daughter] 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 1352 [her son-in-law] William Wittelsbach I Duke Lower Bavaria (age 21) and [her daughter] 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.