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|parents=Philip and Ann Plater Key}}

|parents=Philip and Ann Plater Key}}

'''Philip Barton Key, Jr.''' (September 2, 1804 – May 4, 1854), was an ante=bellum planter in [[Louisiana]], who served in his state's House of Representatives. He was a cousin of his mentor, [[Francis Scott Key]].

'''Philip Barton Key, Jr.''' (September 2, 1804 – May 4, 1854), was an ante-bellum planter in [[Louisiana]], who served in his state's House of Representatives. He was a cousin of his mentor, [[Francis Scott Key]].

Key was born in the Georgetown section of [[Washington, D.C.]], a son of the senior Philip Barton Key (1757-1815), a member of the [[United States House of Representatives]] from [[Maryland]] and later, briefly, a United States District Court judge. His mother was the former Ann Plater (1774-1834), a daughter of [[Governor]] George Plater of Maryland. He studied law under his cousin, Francis Scott Key. He was twice married; his first wife, the former Maria Brent Sewall of Prince Georges County, Maryland, died in 1831. He then married his sister-in-law, the former Maria Laura Sewall (1812-1890) of St. Mary County, Maryland, by whom he had ten children.<ref name=bio/> 

Key was born in the Georgetown section of [[Washington, D.C.]], a son of the senior Philip Barton Key (1757-1815), a member of the [[United States House of Representatives]] from [[Maryland]] and later, briefly, a United States District Court judge. His mother was the former Ann Plater (1774-1834), a daughter of [[Governor]] George Plater of Maryland. He studied law under his cousin, Francis Scott Key. He was twice married; his first wife, the former Maria Brent Sewall of Prince Georges County, Maryland, died in 1831. He then married his sister-in-law, the former Maria Laura Sewall (1812-1890) of St. Mary County, Maryland, by whom he had ten children.<ref name=bio/>