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 "Maryland Day"): Maryland Day on 25 March celebrates the 1634 landing at St Clements.
Relevant evidence: No