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)? 
Sentence (from "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).
Relevant evidence: Yes