Seneca Flag Animals in silhouette figure prominently on the flag of the Seneca Nation of Indians. The Seneca were named the "Keeper of the Western Door" because they were the westernmost Iroquois tribe. SHARE: Download: Full Size (0.03 MB) Credit: Courtesy of the Seneca Iroquois National Museum VIRIN: 201125-O-D0439-004A.JPG Photo Gallery