1638 treaty:  The Pequot War of 1636 and 1637 saw the virtual elimination of the Pequot Indians. The victors met to decide on the division of the fruits of victory. While the treaty settled the Pequot War, the Pequots were not a party to it. The Massachusetts Bay Colony, the Connecticut River Colony, the Mohegan and Narragansett tribes were. Surviving prisoners were divided between the tribes; 40 percent each and the remaining 20 percent awarded to tribes on Long Island who had supported the Narragansett. The Pequot lands went to the Connecticut River towns. The other major feature of this treaty was to outlaw the Pequot language and name. Any survivors would be referred to in the future as Mohegans or Narragansett. No Pequot town or settlement would be allowed. This treaty was signed on September 21, 1638.
http://en.wikipedia.org/wiki/Treaty_of_Hartford

By Samuel Mason

Rhode Island Historical Society collections Vol 3
Pg 177-178: ARTICLES BETWEEN YE INGLISH IN CONNECTICUT AND THE INDIAN SACHEMS—
A Covenant and Agreement made between the English habiting the Jurisdiction of the River of Connecticut of the one part, and Miantinomy the chief Sachem of the Narragansetts in the behalf of himself and the other Sachems there; and Poquim or Uncas the chief Sachim of the Indians called the Mohegans in the behalf of himself and the Sachims under him, as Followeth, at Hartford the 21th of September, 1638.

Imp’r. There is a peace and a Familiarity made between the sd Miantinome and Narraganset Indians and the sd Poquim and Mohegan Indians, and all former Injuryes and wrongs offered each to other Remitted and Burryed and never to be renued any more from henceforth.
2. It is agreed if there fall out Injuryes and wrongs for fuetur to be done or committed Each to other or their men, they shall not presently Revenge it But they are to appeal to the English and they are to decide the same, and the determination of the English to stand And they are each to do as is by the English sett down and if the one or the other shall Refuse to do, it shall be lawfull for the English to Compel him and to side and take part if they see cause against the obstinate or Refusing party.
3. It is agreed and a conclusion of peace and friendship made between the sd Miantinome and the sd Narragansetts and the so Poquim and the sd Mohegans as long as they carry themselves orderly and give no just cause of offence and that they nor either of them do shelter any that may be Enemyes to ye English that shall or formerly have had hand in murdering or killing any English man or woman or consented thereunto, They or either of them shall as soon as they can either bring the chief Sachem of our late enemies the Peaquots that had the chief hand in killing the English, to the sd English, or take of their heads, As also for those murderers that are now agreed upon amongst us that are living they shall as soon as they can possibly take off their heads, if they may be in their custody or Else whensoever they or any of them shall come Amongst them or to their wigwams or any where if they can by any means come by them.
4. And whereas there be or is reported for to be by ye sd Narragansetts and Mohegans 200 Peaquots living that are men besides squawes and paposes. The English do give unto Miantinome and the Narragansetts to make up the number of Eighty with the Eleven they have already, and to Poquime his number, and that after they the Peaquots shall be divided as above sd, shall no more be called Peaquots but Narragansetts and Mohegans and as their men and either ofthem are to pay for every Sanop one fathom of wampome peage and for every youth half so much and for every Sanop papoose one hand tobe paid at Killing time of Corn at Connecticut yearly and shall not suffer them for to live in the country that was formerly theirs but is now the Englishes by conquest neither shall the Narragansets nor Mohegans possess any part of ye Peaquot country without leave from the English And it is always expected that the English Captives are forthwith to be delivered to the English, such as belong to Connecticut to the Sachems there, And such as belong to the Massachusetts; the sd agreements are to be kept invoylably by the parties abovesd and if anymake breach of them the other two may joyn and make warr upon such as shall break the same, unless satisfaction be made being Reasonably Required.
The Marke of : ) MIANTINOMMY,
The Marke of + POQUIAM alias UNKAS.
JOHN HAINES,
ROG’R LUDLOW,
EDW’RD HOPKINS.
The above written is a coppy of some Articles made with the Indians and English as attest, compared by
SAMUELL MASON, Assistant.
JOHN TRACY, Justice of peace.
The above written is a true copy of that on file. Compared and Examined p.
JA. MEINZIES, Cler. Cur. Commis.