*Margaret Comyn
born 1217 Scotland

father:
*William Comyn Earl of Buchan
born 1163 Altyre, Moray, Scotland
died about 1233 Buchan, Aberdeen, Scotland

mother:
*Margaret Colhan Heiress of Buchan
died about 1242/44

siblings:
*Elizabeth Comyn born about 1223 Buchan, Aberdeenshire, Scotland died 1267
Richard Comyn
*Idonea Comyn born about 1219 Altyre, Morayshire, Scotland
Fergus Comyn born about 1219 Altyre, Morayshire, Scotland
William Comyn II born about 1217 Altyre, Morayshire, Scotland
*Alexander Comyn Earl of Buchan born about 1217 Buchan, Aberdeen, Scotland died 6 April 1290

spouse (1st):
*Sir John de Keith Marischal of Scotland
born 1212 Scotland
died before 1270

children:
*Sir William de Keith
born 1236 Humbie, Scotland
died before 1293

spouse (2nd):
*William Earl of Ross
born about 1223
died May 1274

children (from 2nd marriage):
*William Ross
born about 1249 Fearn, Ross & Cromarty, Scotland
died after 28 January 1322

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com
Under some sourses she is listed as Jean or Margaret (Jean) with a birth of 1198 and mother of Sarah Fitzhugh.
Their may well be a Jean but she is 20 years too early for William so Margaret it is.
Also sources for Margaret Comyn list her as having both men as spouses.