The Treaty of Armens was a diplomatic agreement between the Sheliak Corporate and the United Federation of Planets which set the border, along with a buffer zone, between the two powers. (TNG novel: The Buried Age)
It was drafted in the year 2255 and contained 500,000 words which took 372 Federation legal experts to draft. As part of the dictates of the treaty, several Class H worlds were ceded from the Federation to the Sheliak. The establishment of a Federation colony on Tau Cygna V in 2270 was a clear violation of the treaty and allowed the Sheliak to exercise their right to remove it in 2366. (TNG episode: "The Ensigns of Command")
