Ethelred (died c. 1093 Edelret mac Maíl Coluim or Æthelred Margotsson) was the son of King Malcolm III of Scotland (Gaelic Máel Coluim III) and his wife Margaret of Wessex, the third oldest of the latter and the probable sixth oldest of the former. He took his name, almost certainly, from Margaret's great-grandfather Æthelred the Unready. He became the lay abbot of Dunkeld.

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Ethelred (died c. 1093 Edelret mac Maíl Coluim or Æthelred Margotsson) was the son of King Malcolm III of Scotland (Gaelic Máel Coluim III) and his wife Margaret of Wessex, the third oldest of the latter and the probable sixth oldest of the former. He took his name, almost certainly, from Margaret's great-grandfather Æthelred the Unready. He became the lay abbot of Dunkeld. Brothers Ethelred had four brothers who would rule as kings of Scotland. His older half-brother was King Duncan II of Scotland (the son of Malcolm III's first wife, Ingibiorg Finnsdottir). Duncan reigned from May 1094 to 12 November 1094. Of his full brothers (the sons of Margaret), Edgar reigned from 1097 to 1107; Alexander I, from 1107 to 1124; and David I, from 1124 to 1153. Another brother, Edward, died alongside his father at the Battle of Alnwick in Northumberland in 1093. His brother Edmund became a monk. Lay Abbot of Dunkeld

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