Sinclairs in England before conquest

I found this on the Internet. I wonder, can it be truth?

"Sinclairs were England long before the Norman conquest. King Offa (AD
757-796) was the king of Mercia, an Anglo-Saxon kingdom. He was one of
the most powerful Anglo-Saxon kings and controlled the territory south
of the River Humber, taking in most of England. Recently, Niven has by
hard work, has identified Sinclair names from the Doomsday Book. Many
of names identified are pre conquest names.

Philippe Sinclair who died 844 was the first one who we can clearly
identify. He was in the Earl of Tarleton. The Barons of Sinclair.
Were Tudur 1 and 2, Raymond, Trilla, Quinna. The original Holy Light
(Saint Clair) title Holders were men who protected the Merovingian
kings of France. Charlemagne sent to his friend and correspondent,
Offa, king of Mercia. Sinclairs around 780. Interestingly enough the
spelling was then Sinclair. This is the list of people bearing the
title Sinclair in pre conquest Mercia in the Earldom of Tarleton and
Barony of Sinclair are . Sinclair, Adelphia; Sinclair, Albert;
Sinclair, Bonner; Sinclair, Bonner (1); Sinclair, Dauphine; Sinclair,
Duvessa Alpina; Sinclair, Lauretta; Sinclair, Neva; Sinclair, Paulin;
Sinclair, Paulina; Sinclair, Peter; Sinclair, Philippe; Sinclair,
Quinna; Sinclair, Raymond; Sinclair, Trilla; Sinclair, Tudur;
Sinclair, Tudur (1). The multiple names designated by (1) are repeated
names in different generations."



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    ... The possibility exists that a St. Clair or two had contacts ... 757-796) was the king of Mercia, ... has identified Sinclair names from the Doomsday Book. ... Offa, king of Mercia. ...
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