Sarah Lyons

Sentinel Sarah Lyons is the commander of the elite Lyons' Pride squad, and the highest ranking Brotherhood of Steel officer at the Citadel after her father Elder Owyn Lyons in Fallout 3.

After the death of Owyn, Sarah succeeded him as elder, and remained in that position until she was killed in action, paving the way for Arthur Maxson's rise, and his eventual appointment as elder in Fallout 4.