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The flag of the State of Maryland is the 17th-century heraldic banner of arms of Cecil, 2nd Baron Baltimore. It consists of the escutcheon (heraldic shield) of his father George, 1st Baron Baltimore (1579–1632), with the charges and fields from his coat of arms quartered with those of his grandmother, heiress of the Crossland family in the Kingdom of England. The flag was officially adopted by the General Assembly of Maryland (state legislature) in 1904.

Source: Wikipedia