John Mason was an English-born settler, soldier, commander and Deputy Governor of the Connecticut Colony. Mason was best known for leading a group of Puritan settlers and Indian allies on a combined attack on a Pequot Fort in an event known as the Mystic Massacre. The destruction and loss of life he oversaw effectively ended the hegemony of the Pequot tribe in southeast Connecticut.

Dorchester is a Bostonian neighborhood comprising more than 6 square miles (16 km2) in the City of Boston, Massachusetts, United States. Originally, Dorchester was a separate town, founded by Puritans who emigrated in 1630 from Dorchester, Dorset, England, to the Massachusetts Bay Colony. This dissolved municipality, Boston's largest neighborhood by far, is often divided by city planners in order to create two planning areas roughly equivalent in size and population to other Boston neighborhoods.