"Wace mentions the Sire de St. Clair at Hastings. This was Richard de St. Clair who held lands, Suffolk, 1086, CITATION[CLOSE]
Williams, Dr Ann. And G.H. Martin, Eds., Domesday Book A Complete Translation. London: Penguin, 1992. Print. (ISBN 0-141-00523-8)" CITATION[CLOSE]
The Norman People and Their Existing Descendants in the British Dominions and the United States Of America. Baltimore: Genealogical Publishing, 1975. Print. (ISBN 0-8063-0636-X) The Domesday Book also notes that Britel de St. Clair, brother of the aforementioned Richard de St. Clair held lands in Somerset. Britel's son William de St. Clair held lands in Dorset in 1130.
Despite these early records in England, the name is more often than not associated with Scotland. For it is there that the name excelled both in numbers and power. "The first Sinclairs in Scotland appear to have been vassals of the great territorial magnates, de Morville. Their first possession in Scotland was the barony of Roslin, near Edinburgh, which they held in the reign of David I (1124-1153). The earliest bearers of the name appear in charters connected with the abbeys of Dryburgh and Newbattle, the Hospital of Soltre (now Soutra in Midlothian), the church of Glasgow, etc." CITATION[CLOSE]
Black, George F., The Surnames of Scotland Their Origin, Meaning and History. New York: New York Public Library, 1946. Print. (ISBN 0-87104-172-3)
Sir Henry Sinclair fought with King Robert the Bruce at Bannockburn, and helped assure the independence of the Scottish Kingdom. Sir Henry's son married Isabel, the heiress of the earldom of Orkney, and their son became the senior Earl of Norway. The Clan achieved great status having married into both Norwegian and Scottish royalty.
Back in England, the name prospered as well as The Hundredorum Rolls of 1273 confirms: John de Sanet Claro in Suffolk; Robert de Sancto Claro in Somerset; and William de Sancto Claro in Kent. CITATION[CLOSE]
Bardsley, C.W, A Dictionary of English and Welsh Surnames: With Special American Instances. Wiltshire: Heraldry Today, 1901. Print. (ISBN 0-900455-44-6)
Over in Somerset, from the first listing above, Richard Seinteclere and William Seyncler were both listed in Kirby's Quest. CITATION[CLOSE]
Dickinson, F.H., Kirby's Quest for Somerset of 16th of Edward the 3rd London: Harrison and Sons, Printers in Ordinary to Her Majesty, St, Martin's Lane, 1889. Print.
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