Sela

Sela was an officer in the Romulan Empire during the late 24th century. She was the daughter of a Romulan general and a Tasha Yar from an alternate timeline.

Although loyal, her failures to manipulate Georgi La Forge to assassinate a Klingon governor, destroy the Klingon Empire through civil war, and invade Vulcan resulted in her losing favor with the Empire. (TNG episodes: "The Mind's Eye", "Redemption" and "Unification")

By 2369, Sela was reduced to commanding the N'ventnar, an old, failing warbird. (TNG novel: The Romulan Stratagem)

In 2371, Sela attacked the Cardassian labor camp on Lazon II, freeing her mentor Saket and former Maquis Thomas Riker in her plan to destroy the Klingon Empire. (TNG novel: Triangle: Imzadi II)

In 2376, Sela led a Romulan attack on the USS Independence. (TNG novel: Double or Nothing)

In 2379 Sela was stationed on the planet Kevratas, where she abducted Beverly Crusher. (TNG novel: Death in Winter)