There were 2, (technically 3) football teams that called Boston home before the Patriots set up shop in 1960 in the American Football League. Here is the story of the pigskin pioneers in the Hub during the mid 20th century.
This episode is also available as a blog post: https://amsportstalk.wordpress.com/2021/12/13/bulldogs-and-pigskins-and-redskins-oh-my/
On February 25th, 1971, the Boston Bruins faced off against the Vancouver Canucks at the Boston Garden, and achieved of the greatest feats in NHL history.