“This was when there were slaves in Boston”: HBI Founder John Codman acknowledges his ancestor's enslavement of Black Bostonians - Historic Boston Inc (HBI)
historicboston.org
It has come to the attention of Historic Boston Inc. that the family of our organization’s founder, John Codman, had a personal connection to the enslavement of Black Bostonians in the 18th century. We stumbled across this information by chance, as the newest member of...

Nearly 50 years later, Revere references the site of Mark’s execution as a geographic marker that had remained culturally relevant. Mark’s body hung in a gibbet on Charlestown Common for nearly 20 years and his last words were published and sold next to a prison on Queen Street. His body and last words, immortalized in print, would serve as a terrorizing reminder to the enslaved population of Boston of what the cost of resistance would be. Even while their white counterparts were actively organizing to free themselves from the rule of the British monarchy.

Sources:

Wikipedia - Mark Codman

Historic Boston Inc - Article on Mark and Phyllis Codman, Their Crimes, and Executions