'Thomas Clagett, born in London, April 3, 1645, the youngest son of Edward Clagett and Margaret Adams, daughter of the Lord-Mayor of London, was the first of the Clagetts to immigrate to America. In England, as a young man, Thomas was an officer in his Majesty’s Navy and is identified as Captain Thomas Clagett in Maryland genealogical records. He arrived in the Province of Maryland in 1670. He was a landowner of a number of large tracts of land in the Province-Goodlington Manor on the Eastern Shore, Weston with 800 acres near Upper Marlborough, Greenland and Croome in Prince George’s County, and an estate near St. Leonard’s Town where he lived. He inherited land in England at his father’s death, which he later willed to his eldest son Edward, who returned to England to claim them. His second son, Thomas, stayed in America and claimed the estate of Weston which remains today in the Clagett family.
Captain Thomas Clagett was a vast landowner from the start, which identifies him as a man of credit and worthy of land grants. He was a Captain in the Calvert County militia. He held the office of Commissioner of Calvert County, Coroner (1687) and Vestryman of Christ Church Parish in Calvert County (1692). Until his death in 1703, he remained a respected gentleman, a man of substance and importance in his chosen country.'
Biography on the website of The National Society of the Colonial Dames of America.
http://nscda.org/historical-activities/ancestor-biographies/#bio-C