Countess Ursa Wren was a human female Mandalorian warrior, the mother of Tristan and Sabine Wren, and the leader of Clan Wren. She was part of Death Watch, a Mandalorian splinter group that took over Mandalore during the Clone Wars. Mandalore was occupied by the Galactic Empire after the war's end, and Sabine Wren attended the Imperial Academy on the planet. Wren fled the Academy, however, bringing shame upon her family.
Due to her daughter's actions, Clan Wren were treated with suspicion by the other clans. Ursa's husband was kept as a hostage by Viceroy Gar Saxon to ensure her family's cooperation while her son Tristan was forced to join the Imperial Super Commandos. In an effort to protect Sabine, Ursa did not search for her daughter. In public, Ursa sided with the Empire and the Emperor's Hand Saxon. In 2 BBY, Ursa was reunited with her daughter Sabine, who had joined the rebellion and had returned to seek her famil's support for the rebels.
Unwilling to antagonize Saxon, Ursa was initially cold towards her daughter and the rebel emissaries Kanan Jarrus and Ezra Bridger. Ursa's pragmatism clashed with Sabine's idealism. In an attempt to save Sabine's life, Ursa tried to trade the other rebels and the Darksaber with Saxon. However, Saxon reneged on the offer and ordered his men to exterminate Clan Wren, Ursa and her family joined forces with the rebels and the Journeyman Protector Fenn Rau to defeat Saxon's forces. Sabine defeated Saxon in a duel but chose to spare his life. When Saxon tried to kill Sabine, Ursa shot the Viceroy. Ursa, her daughter, and her family then joined forces to reunify the Mandalorian people.