Forteith of Strathearn was born about 1070. [1]
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S > Strathearn | O > of Strathearn > Forteith (Strathearn) of Strathearn
Categories: Scotland, Medieval Unsourced Profiles
This profile definitely needs work, but the sources you list are considered unreliable for medieval Scottish profiles. Please see https://www.wikitree.com/wiki/Space:Scotland_Project_Reliable_Sources.
Jen
https://en.wikipedia.org/wiki/Ferteth,_Earl_of_Strathearn
https://www.geni.com/people/Ferteth-Earl-or-Mormaer-of-Strathearn/6000000004148943482?through=6000000012060155334
https://www.thepeerage.com/p10775.htm#i107748
I don't know where the profile creator got the info showing for his birth and death though, as what is on this page doesn't match what any of the other sites have.
Geni shows that info as:
Birth: estimated between 1145 and 1145 Death: 1171
The Peerage states: He died before December 1170
WIkipedia states: He died in 1171
Notice there are no places given for either his birth or death.
Also, he was the second-known earl or mormaer of Strathearn.
His Geni profile has a lot more details and lists additional links:
FERTETH (aka FERQUHARD) Earl of Strathearn Genealogy The Scots Peerage VIII: 240-1 Medieval Lands
Please see https://www.wikitree.com/wiki/Help:Reliable_Sources.
The wikipedia entry is good but not a source, the others are far too unreliable as I find them full of errors. Suggest Scottish History Society "Charters of Inchaffray Abbey" and especially Cynthia J. Neville' s 1983 thesis at Aberdeen University "The Earls of Strathearn from mid-12th to mid-14th centuries" Vol.1 Chapter Two as the best and both available on-line. Unfortunately at present I am occupied elsewhere or would tackle this.