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elder son. NATIVE: third generation. RESIDED: at
"Sotterly," St. Mary's County. FAMILY BACK-
GROUND. FATHER: George Plater (1695-1755).
MOTHER: Rebecca (1703-?), widow of James
Bowles (?-ca. 1727/28); daughter of Thomas Ad-
dison (1679-1727). STEPMOTHER: Elizabeth (?-
1750), widow of Capt. James Carpenter of An-
napolis. HALF UNCLE: John Addison (1713-1764).
AUNTS: Elinor Addison (1705-?), who married
fourth, Corbin Lee (?-1774); Ann Plater, who
possibly married Charles Carroll (1691-1755).
HALF AUNT: Ann Addison (1711/12-1753), who
married William Murdock (ca. 1710-1769). HALF
OR STEP AUNTS: Gertrude Rousby (?-ca. 1770),
who married in 1746 Robert Jenkins Henry (ca.
1712-1766); Elizabeth Rousby, who married
Abraham Barnes (?-ca. 1778). STEPAUNT. Ann
Rousby (1721-1769), who married Edward Lloyd
(1711-1770). BROTHER: Thomas Addison (1738-
died young). SISTERS: Rebecca (1731-1787); Anne
(1732-died young); Elizabeth (1742-?). HALF
FIRST COUSINS: Addison Murdock (1731-1793);
Joseph Sim (?-1793). HALF OR STEP FIRST COUS-
INS: John Barnes (ca. 1743-1800); Richard Barnes
(?-1804); and Edward Lloyd (1744-1796). MAR-
RIED first, on December 5, 1762, in Charles County,
Hannah (?-1763), daughter of Richard Lee (ca.
1707-1787) and wife Grace Ashton (ca. 1713-
1789). Hannah was the granddaughter of Philip
Lee (ca. 1681-1744). She was the niece of Francis
Lee (?-1749); Arthur Lee (?-1760). She was the
half niece of Corbin Lee (?-1774); George Lee
(1736-1807); Lettice Lee (?-1776), who married
third, Joseph Sim (?-1793); and Hannah Lee (ca.
1736-by 1781), who married second, Joseph Sprigg
(1736-1800). She was the stepniece of Nicholas
Lewis Sewall (ca. 1721-1800). Her brothers were
Philip Thomas Lee (1738-1778); Richard, Jr. (?-
1834). Her sisters were Sarah Lattice (?-1761),
who married Philip Richard Fendall (?-?); Alice
(1748-1789), who married in 1788 John Weems
(1737-1813); and Eleanor Ann (?-1806). Her
first cousins were Thomas Sim Lee (1745-1819);
Philip Richard Fendall (?-?); Sarah Fendall (ca.
1732-1793), who married Thomas Contee (ca.
1729-1811); Rebecca Potts (?-by 1810), who
married Benjamin Mackall IV (1745-by 1810);
Richard Potts (1753-1808); and Sarah Eleanor
Potts, who married Thomas Gantt, Jr. (?-1808).
MARRIED second, on July 19, 1764, Elizabeth (?-
1789), daughter of John Rousby (1728-1750/51)
and wife Ann Frisby (1727-1793); stepdaughter
of William Fitzhugh (ca. 1722-1798); grand-
daughter of both John Rousby (1685-1744) and
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Peregrine Frisby (1688-1739). Elizabeth was the
niece of Anne Rousby (1721-1769), who married
Edward Lloyd (1711-1770); Elizabeth Rousby, who
married Abraham Barnes (?-ca. 1778); and Ger-
trude Rousby (?-ca. 1770), who married in 1746
Robert Jenkins Henry (ca. 1712-1766). Her step-
brothers were George Fitzhugh; John Fitzhugh,
who married Elizabeth, daughter of Richard Par-
ran (?-ca. 1782); William Fitzhugh, Jr. (1761-
1839); and Capt. Peregrine Fitzhugh (ca. 1760-
?), who married Elizabeth Crowley, daughter of
Samuel Chew (by 1734-1786). Her first cousins
were Elizabeth Lloyd (1742-?), who married in
1768 John Cadwalader (1741/42-1786); Edward
Lloyd (1144-1196); John Barnes (ca. 1743-1800);
Richard Barnes (?-1804); Edward Tilghman (1713-
1785); Peregrine Tilghman (ca. 1741-1807); James
Tilghman (1743-1809); and Henrietta Maria Lloyd
(?-1822), who married William Hayward, Jr. (ca.
1758-1834). CHILDREN. SONS: George (1766-1802),
who served in the Lower House from St. Mary's
County in 1790, 1792, and 1793, and who married
first, in 1795, Cecelia Bond Brown (?-1796),
daughter of Col. Richard Bond of St. Mary's
County and wife Susanna Gardiner Key (1751-
?), and married second, in 1798, Elizabeth (?-
1802), daughter of William Somerville (1755-1806);
John Rousby (1767-1833), who married in 1790
in Anne Arundel County, Elizabeth, daughter of
James Tootell; Thomas (1769-1830), who mar-
ried second, Evelina Buchanan; and William.
DAUGHTERS: Ann (ca. 1774-1834), who married
in 1790 Philip Barton Key (1757-1815); Rebecca
(1765-?), who married Uriah Forrest (1746-1805).
PRIVATE CAREER. EDUCATION: graduated from the
College of William and Mary in 1752. RELIGIOUS
AFFILIATION: Anglican, All Faith Parish, St. Mary's
County, 1735-1763, St. Andrew's Parish, St.
Mary's County, 1764-1792. SOCIAL STATUS AND
ACTIVITIES: Mr., by 1755; Esq., by 1756; Hon.,
by 1765. Plater was a Mason. As a member of
the Leonardtown Lodge, he served as junior war-
den and worshipful master. OCCUPATIONAL PRO-
FILE: planter; probably lawyer. PUBLIC CAREER.
LEGISLATIVE SERVICE: Lower House, St. Mary's
County, 1757-1758 (Accounts 1), 1758-1761 (Bills
of Credit Cv 1, 1, Cv 2), 1762-1763, 1765-1766
(Public Offices 2, 3); Upper House, 1771, 1773-
1774; Conventions, St. Mary's County, 6th-8th,
1775-1776 (did not attend the 6th Convention),
9th 1776; Senate, Western Shore, Term of 1776-
1781: 1777, 1777-1778, 1778-1779, 1779-1780
(did not attend), 1780-1781 (elected president
on January 29, 1781, to replace Daniel of St. Thomas
651
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