Sassoonan or Allumapees (c. 1675 - 15 October, 1747) was a Lenni Lenape chief who lived in Pennsylvania in the late 17th and early 18th century. He was known for his negotiations with the Provincial government of Pennsylvania in several land purchases. He was a respected leader until political intrigue and migration of the Lenape into the Ohio Country diminished his influence. During his final years he became dependent on alcohol and died in Shamokin in 1747. After his death the Lenape were without a chief until 1752, when the Iroquois half-king Tanacharison appointed Shingas to represent them at the Logstown Treaty conference. He was a son of Tamanend, also known as "Tammany," a well-respected Lenape sachem known as a lover of peace and friendship.