Question: The flag of the city of Baltimore features the "Battle Monument", which is also the central motif on the city's seal, the field is in the Calvert family colors of black and yellow / gold (sometimes orange) and design, which also appear in the first and fourth quarters of the Maryland state flag, is taken from the sheild of the Calvert-Crossland families coats-of-arms, and consists of the heraldic banner of who, the first Lord Baltimore (1579–1632)? 

Context paragraphs:
Flag of Baltimore: The flag of the city of Baltimore features the "Battle Monument", which is also the central motif on the city's seal.  The field is in the Calvert family colors of black and yellow / gold (sometimes orange) and design, which also appear in the first and fourth quarters of the Maryland state flag taken from the sheild of the Calvert-Crossland families coats-of-arms.

Battle Monument: The Battle Monument, located in Battle Monument Square on North Calvert Street between East Fayette and East Lexington Streets in Baltimore, Maryland, commemorates the Battle of Baltimore with the British fleet of the Royal Navy's bombardment of Fort McHenry, the Battle of North Point, southeast of the city in Baltimore County on the Patapsco Neck peninsula, and the stand-off on the eastern siege fortifications along Loudenschlager and Potter's Hills, later called Hampstead Hill, in what is now Patterson Park since 1827, east of town.  It honors those who died during the month of September 1814 during the War of 1812.  The monument lies in the middle of the street and is between the two Baltimore City Circuit Courthouses that are located on the opposite sides of North Calvert Street.  It was sponsored by the City and the "Committee of Vigilance and Safety" led by Mayor Edward Johnson and military commanders: Brig. Gen. John Stricker, Maj. Gen. Samuel Smith and Lt. Col. George Armistead (of Ft. McHenry).

William Claiborne: William Claiborne also, spelled Cleyburne (c. 1600 – c. 1677) was an English pioneer, surveyor, and an early settler in the colonies/provinces of Virginia and Maryland and around the Chesapeake Bay.  Claiborne became a wealthy planter, a trader, and a major figure in the politics of the colonies.  He was a central figure in the disputes between the colonists of Virginia and the later settling of Maryland, partly because of his earlier trading post on Kent Island in the mid-way of the Chesapeake Bay, which provoked the first naval military battles in North American waters.  Claiborne repeatedly attempted and failed to regain Kent Island from the Maryland Calverts, sometimes by force of arms, after its inclusion in the lands that were granted by a 1632 Royal Charter to the Calvert family (to Sir George Calvert, first Baron and Lord Baltimore, (1579-1632), by the reigning King of England, Charles I, (1600–1649, reigned 1625 to execution, 1649), thus becoming Maryland territory.

Flag of Washington: The state flag of Washington consists of the state seal, displaying an image of state namesake George Washington, on a field of dark green with gold fringe being optional.  It is the only U.S. state flag with a field of green as well as the only state flag with the image of an American president.  The Secretary of State regulates flag protocol related to the state flag, as well approving replica flags for commercial sale and other standards related to the flag.

Cecil Calvert, 2nd Baron Baltimore: Cecil Calvert, 2nd Baron Baltimore (8 August 1605 – 30 November 1675), was the first Proprietor and Proprietary Governor of the Province of Maryland, and ninth Proprietary Governor of the Colony of Newfoundland and second of the colony of Province of Avalon to its southeast.  His title was "Cecil Calvert, Second Baron Baltimore, First Lord Proprietary, Earl Palatine of the Provinces of Maryland and Avalon in America".  He received the proprietorship after the death of his father, George Calvert, 1st Baron Baltimore, (1579 – 15 April 1632), for whom it had been intended.  Cecil Calvert established and managed the Province of Maryland from his home, Kiplin Hall, in North Yorkshire, England.  As an English Roman Catholic, he continued the legacy of his father by promoting religious tolerance in the colony.

Flags of counties of the United States: The flags of the counties of the United States of America exhibit a wide variety of regional influences and local histories, as well as widely different styles and design principles.  For example, some Floridian and Alabamian municipality flags feature a saltire, due to saltires being used on their state flags.  Some Maryland county flags feature the coat of arms of the Calvert family, as it is featured on the Maryland state flag, and due to the Calvert family's prominence in Maryland history.  Many counties went decades without a flag, until a certain event, such as a local sesquicentennial or the American bicentennial, spurred the creation of a flag.  Frederick County, Maryland is one example, in 1976, it hosted a contest, asking the public to submit their designs to a commission.  A panel then reviewed the five winning entries, choosing one to become the official county flag.  Frederick County's example is typical of the flag adoption processes that many counties undertook with their flags.  The 250th anniversary of Augusta County, Virginia's founding also spurred the creation of a flag, in 1988.  Some flags, such as the flags of Montgomery County, Maryland, and Loudoun County, Virginia, were created by foreign entities, such as the College of Arms in the United Kingdom.

Arthur Aston: Sir Arthur Aston (died 1627) was appointed Proprietary Governor of Avalon in 1625 by Sir George Calvert, (1579-1632), former Secretary of State for Foreign Affairs to King James I of England (and earlier James VI of Scotland), (later titled first Baron and Lord Baltimore in Ireland and received charter from King Charles I of the Kingdom of England in 1632 just before his death to found colonial Province of Maryland further south along Chesapeake Bay in future United States of America, carried out in 1634 by his eldest son/heir Cecilius Calvert, second Baron and Lord Baltimore, [1605-1675], and nephew Leonard Calvert, [1606-1647], first provincial Governor of Maryland).  Aston was a devout Roman Catholic and was recommended by Father Stout to govern the Catholic colony.  Aston arrived in Ferryland, Avalon's capital, around 1626 but returned to England the next year to resign his position and join the forces of the George Villiers, first Duke of Buckingham in France, where he died the same year.

Philip Darnall: Philip Darnall (born 1604), was an English barrister.  His son Henry Darnall, (1645–1711), emigrated to North America, where he became the Proprietary Agent of George Calvert, the first Lord Baltimore, (1579–1632), and George Calvert's son, Cecilius Calvert, second Lord Baltimore, (1605–1675) and the founder of Maryland.

Flag of Maryland: The official flag of the state of Maryland consists of the heraldic banner of George Calvert, the first Lord Baltimore (1579–1632).  The flag was officially adopted by the Maryland General Assembly in 1904.

Maryland Day: Maryland Day is a legal holiday in the U.S. state of Maryland.  It is observed on the anniversary of the March 25, 1634, landing of the first European settlers in the Province of Maryland, the third English colony to be settled in British North America.  On this day settlers from ""The Ark"" and the smaller ""The Dove"" first stepped foot onto Maryland soil, at St. Clement's Island in the Potomac River.  The settlers were about 150 in number, departed from Gravesend on the Thames River downstream from London.  Three Jesuit priests were collected from Cowes on the Isle of Wight in England where they avoided having to give the oath of allegiance and supremacy to the King.  The colony's grant was renewed to Cecil Calvert, 2nd Baron Baltimore, (1605-1675), two years prior by Charles I of England, after first being given to his father Sir George Calvert, 1st Baron Baltimore, (1574-1632), along with the title of "Lord Baltimore", and a first grant in Acadia, in Newfoundland, (modern Canada), (title named after lands and town Baltimore, in Ireland) who had served the King in many official and personal capacities as Secretary of State, 1619-1625 (despite his conversion to Roman Catholicism).  In thanksgiving for the safe landing, Jesuit Father Andrew White celebrated the Mass for the colonists led by the younger brother of Lord Baltimore, Leonard Calvert, (1606-1647), who served as the first governor, and perhaps for the first time ever in this part of the world on the first landing at Blackistone Island, later known as St. Clement's Island off the northern shore of the Potomac River, which was the new border between the new colony and the earlier English settlements in Virginia) and erected a large cross.  The landing coincided with the Feast of the Annunciation, a holy day honoring Mary, and the start of the new year in England's legal calendar (prior to 1752).  Maryland Day on 25 March celebrates the 1634 landing at St Clements.  Later the colonists and their two ships sailed further back down river to the southeast to settle a capital at St. Mary's City near the point where the Potomac flows into the Chesapeake Bay.

Supporting paragraphs: Flag of Baltimore Flag of Maryland
Answer: George Calvert