third
son, Gilbert,[3] a fourth, William, and a fifth, Angus, who had a son
Gillebert or Gillebryd. Gilchrist died about 1204, leaving an eldest
son, Duncan, Earl of Angus, and another son called Magnus, by his two
wives respectively, his second wife, from the name of Magnus given to
her eldest son and to many subsequent earls of that son's line, being
assumed with considerable probability to have been, not a sister of
Earl John, but a sister of Harald Ungi, either Ingibiorg or Elin.
Duncan died about 1214, and left a son, Malcolm, Earl of Angus, whose
sole heiress was a daughter, Matilda, who, about 1240, married, first,
John Comyn, who was killed in France shortly after the marriage,
without leaving issue to inherit. As her second husband, Matilda,
Countess of Angus married Gilbert d'Umphraville, Lord of Prudhoe and
Redesdale in Northumberland in 1243; and their son, also named Gilbert
d'Umphraville, was born about 1244, and succeeded his father as Earl
of Angus in 1267, and though both these Gilberts became successively
Earls of Angus,[4] neither of them ever became Earl of Orkney.
Robertson's contention in his _Early Kings of Scotland_, (vol. II, p.
23 note) that they were grafted on the wrong pedigree seems justified
by the discrepancy in dates; for the Icelandic Annals give only one
Gibbon who died in 1256, and we know that Magnus III was earl in 1263
and till 1273. Indeed little confidence can be reposed in the Diploma
of the Orkney Earls, the only authority for the existence of two
Orkney Earls called Gilbert, and in the period covered by the
_Orkneyinga Saga_, we can prove many errors in the Diploma.

Of Magnus son of Gilchrist, Earl of Angus, we know something. He was
alive in 1227, when he attested the record of the perambulation of the
boundaries of the lands of the Abbey of Aberbrothock,[5] and in the
List of the Oliphant family charters dated 1594 in the Register House
in Edinburgh there is an entry of "Ane charter under the Great Seill
made be Alexr to Magnus sone to Gylcryst sometime Earle of Angus of
the Erledome of South Caithness" which included Berridale and lands
which Magnus' granddaughter's great-grandson Malise II conveyed to
Reginald Chen III, known as "Morar na Shein," after 1340.

It has been suggested that after Earl John's death in 1231, the
successor to the earldom of Caithness was a minor, which Earl
Gilchrist's son, Magnus, could not have been in 1231, and that this
minor and ward was a