High Quality Content by WIKIPEDIA articles! Tamanend or Tammany or Tammamend, the "affable", (c. 1628–1698) was a chief of one of the clans that made up the Lenni-Lenape nation in the Delaware Valley at the time Philadelphia was established. Tamanend is best known as a lover of peace and friendship who played a prominent role in the establishment of peaceful relations among the Native American tribes and the English settlers who established Pennsylvania, led by William Penn.