The Iroquois Tribe is a Native American confederacy of five tribes, including the Oneida (6 letters), Erie (4 letters), Senecas (7 letters), Eries (5 letters), and Seneca (6 letters). The Iroquois Confederacy was formed in the 16th century and is still active today. The Iroquois are known for their matrilineal kinship system, which is based on maternal ancestry and descent. They are also known for their longhouses, which were large multi-family dwellings used by the Iroquois.