Joshua Tefft (10th great uncle) was tried for treason, “The fact that he was known not to have attended church, a considerable offense to the strict Puritan sensibility of the United Colonials, was also used against him at his trial.” The United Colonials were loosely Massachusetts, Plymouth and Connecticut. These Colonials made a plan to take Rhode Island and the Narraganset tribe’s land as their own. Somehow this all gets mixed up in King Philip’s War and Joshua, living on his farm in Rhode Island with his son- his wife dies 2 days after giving birth- attempts to defend his farm, is captured by the fighting Narraganset tribe and held as a slave. That’s one story.

Or Joshua, living peacefully with his family was somehow wronged and left the family and colony to take up with the Indians whether out of spite or pride. He rose in rank to become an advisor to Metacomet, King Philip.

Or, according to some United Colonial Soldiers, Joshua Tefft’s deceased wife was of the Wamponoag tribe and Joshua joined forces with the Narragansets and Wamponoags and fired 20 shots against the colonists.

Definitely Joshua was taken to court. Roger Williams recorded Joshua’s court statements, most court records have been permanently lost. Joshua was definitely convicted of treason, hanged, drawn and quartered. Facts are scarce and it appears the verdict then January 1676 and today is still somewhat undecided. Joshua was the only person executed for treason in New England history. John Tefft (1oth great grandfather) is described as ‘losing his head’ at his son’s execution. John was either beheaded, overwhelmed with grief or could not recover Joshua’s actual head which was supposedly mounted on a stake or used ‘for sport’.

Joshua’s son Peter was about 6 years old when his uncle Samuel (9th great grandfather ) and Jireh Bull were appointed guardians to oversee Peter and his inheritance. Peter lived and grew up with Samuel and Elizabeth Jenckes Tefft. Joshua’s orphan son marries Sarah or Mary Witter they have children and hopefully a happy life.

Sources

Rhode Island Renegade: The Enigma of Joshua Tefft by Calloway, Colin in Rhode Island History. Vol. 43 (November 1984) PDF here pages 136 – 145 image 22 of 38. (This source provides a lot more sources including) 

The Narragansett Historical Register: a Magazine edited by Arnold, James N, Volume 3 pages 164 – 169 at HathiTrust.