She had a relationship with Alexander /Comyn 6th 2nd Earl of Buchan, Justiciar of Scotland.
Child(ren):
Elizabeth was the daughter of Roger de Quincy, , 2nd Earl of Winchester and Helen of Galloway.
She married Alexander Comyn, 2nd Earl of Buchan, who was one of the most important figures in the 13th century Kingdom of Scotland, he was the son of William Comyn, jure uxoris Earl of Buchan, and Marjory, Countess of Buchan, the heiress of the last native Scottish Mormaer of Buchan, Fergus.
Their children were:
John Comyn, 3rd Earl of Buchan, Alexander's successor as Earl of Buchan
Roger
Lord Alexander Comyn, sheriff of Aberdeen, married Joan, sister of William le Latimer, and had issue. Henry de Beaumont would claim the Earldom of Buchan through marriage to their daughter, Alice.
Lord William Comyn, Provost of St. Mary's Church, St. Andrews
Lady Marjorie Comyn, m. Patrick Dunbar, 8th Earl of Dunbar
Lady Emma Comyn, m. Maol Íosa III, Earl of Strathearn
Lady Elisabetha Comyn, m. Gilbert de Umfraville, 1st Earl of Angus
Lady Elena Comyn, m. Sir William de Brechin
Lady Annora Comyn, m. Nicholas de Soules
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=110860350&pid=22932
Elizabeth (Isabel) de Quincy, LadyGender: FemaleAlias name: Isabel /de Quincy/, /Isabel/, Isabel Quincy, Elisabetha de Quincy ComynBirth: Circa 1220 - Winchester, Hampshire, EnglandMarriage: Spouse: Alexander Comyn, 6th/2nd Earl Of Buchan - 1245 - Aberdeenshire, ScotlandDeath: Apr 12 1282 - Buchan, Aberdeenshire, ScotlandBurial: Apr 12 1282 - Co-heiress of her father.Father: Roger de Quincy, Earl of WinchesterMother: Helen de GallowayHusband: Alexander Comyn, 6th/2nd Earl Of BuchanChildren: Alexander II Comyn, ;John Comyn, 3rd Earl of Buchan, Annora Comyn, Elizabeth Comyn, Countess of Angus, Alexander Comyn, IV Earl of Buchan, Elena Comyn, Emma Comyn, Marjory Comyn, Bridget Comyn, Roger Comyn, William Comyn, Marjorie Comyn, Countess of Dunbar, Margaret Comyn, Catherine Comyn, ? DeKeith (born Cumyn), LadySiblings: Margaret de Quincy, Helen Ela de Quincy, of Winchester
Elizabeth De Quincy<br>Gender: Female<br>Birth: 1220 - Winchester, Hampshire, England<br>Marriage: 1245 - Buchan, Aberdeenshire, Scotland<br>Death: Apr 12 1282 - Buchan, Aberdeenshire, Scotland<br>Husband: Alexander Comyn<br>Child: Alexander Comyn