, William Earl of Mar, Chamberlain to Alexander III

   Another name for William was EHISLACH, Uilleam 5th Earl of Mar.

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William married Elizabeth COMYN, daughter of William COMYN Earl of Buchan, jure uxoris, Justiciar of Scotland and Marjory Countess of Buchan, by 1244.¹ (Elizabeth COMYN was born about 1215 and died in 1267 ¹.)

William next married Muriel co-heiress of Muschamp, daughter of Malise (II) 5th Earl of Strathearn and Marjory DE MUSCHAMP co-heiress of Muschamp, after 1267.² (Muriel co-heiress of Muschamp was born about 1245 and died in 1291 ².)

  Marriage Notes:

"3. Muriel, elder daughter and coheiress of Marjory Muschamp, the Earl's (Malise's) first wife, born in 1244; married (after 1267), as his second wife, to William, Earl of Mar, who died in 1281. She survived him, dying between May and November 1291, without issue."

from Scots Peerage (vol 8)

Note:

The phrase "without issue" appears to mean without male issue, rather than without children of either gender. ²