Maryland was the 7th state in the USA; it became a state on April 28,1788. State Capital is Annapolis. Nickname is Old Line State The state flag of Maryland was officially adopted in 1904. It is the only US state flag based on British heraldry (the coats of arms of noble families). The flag's design was based on the coat of arms adopted by George Calvert, the first Lord Baltimore. The alternating yellow and black are from Lord Calvert's family shield; the red and white design is either from Calvert's maternal family, the Crosslands, or his wife's family, the Mynnes.