Gallifreyan Civil War

In addition to the Civil War caused in Gallifrey's earlier days by Morbius, there were at least two Gallifreyan Civil Wars, both engendered by Pandora.

First Civil War
The first Civil War happened when ambitious Time Lady Pandora ascended to the presidency and aimed to make Gallifrey use its temporal power to change the Web of Time for her own ends, declaring herself Imperiatrix. She used an alien bodyguard to enforce her will by killing her opponents. The High Council turned against her, beginning a civil war which devastated the Capitol.

The Council eventually convinced the bodyguard to turn on Pandora and she was captured. The bodyguard was allowed to return to her home planet, however the Time Lords trapped it in a 6.8 second time loop. Pandora was dispersed so completely that she had never existed, with the only reminder that she’d ever existed being the ruined parts of the Capitol which became the Vaults. However, a copy of her consciousness survived in the Matrix, trapped within a Dark Partition. Over time, Pandora gained strength and tried to escape. (AUDIO: Lies)

Prelude
Pandora manipulated Time Lord genetics to produce a potential host through the centuries until the result was Romana. During her time at the Time Lord Academy, Pandora's voice enticed Romana into visiting the Vaults. Pandora told Romana of her Imperiatrix Imprimatur, and of her destiny to rule Gallifrey under her influence. Her tutor Braxiatel learned of the encounter and hypnotised Romana to forget the incident. He resolved to stay close to her to watch for any sign of Pandora’s influence, however Romana was taken off Gallifrey by the White Guardian. During her subsequent travels with the Doctor, Pandora’s influence over Romana was reawakened by the Shadow torturing her. She regenerated to suppress it again.

During her presidency, Romana incited controversy by allowing aliens to attend the Academy, with Darkel becoming a rallying figure for the opposition. During this time, Leela and K9 Mark I explored the Vaults and were lured into a Matrix door by Pandora. Romana and her K9 investigated Leela’s disappearance and encountered Pandora, who revealed the truth by summoning a Matrix projection of Romana’s first incarnation. The two Romanas collaborated to trick her into allowing K9 Mark II to identify her wavelength, enabling him shutdown the partition. Though Pandora had been trapped again, K9 advised Romana not to access the Matrix until he had installed new defences. (AUDIO: Lies)

However, Darkel later released her, aiming to use her release to remove Romana from the presidency. Irving Braxiatel took the past and present forms of Pandora and went into exile on his collection. (AUDIO: Pandora)

The conflict
Romana took to consulting her due to Darkel's attitude toward Romana's policies, through K9 Mark II. During the election following Darkel's right of contest, Romana declared herself Imperiatrix. Whilst K9 was inhabited Pandora there was a terrorist attack on the chapter houses of Gallifrey and the High Council, Pandora tricked Romana into accessing the Matrix and escaped it, using the form of Romana's first incarnation. This led to the next civil war. (AUDIO: Imperiatrix)

During the war, Pandora force-regenerated many Time Lords in order to swell her forces, while Romana destroyed the infrastructure of the planet. Romana also scrambled the Rassilon Imprimaturs of TARDISes to stop the war becoming a time war. It was during one such attack that Narvin was injured and Leela lost her sight. Romana and Hallan went to the Anomaly Vaults to find Wynter's TARDIS but found Aesino, a weapon the Celestial Intervention Agency was planning to use in their missions. Romana then became linked to the sentience that controlled the vault when she escaped from the vault. (AUDIO: Fractures)

From their base in the Time Lord Academy, Romana's allies fought back against Pandora and Darkel. Darkel placed a bug bomb on Narvin in order to try to get him on her side. Unbeknownst to Romana, Pandora had created a technological variant of the Dogma Virus which she planned to used to convert all the Time Lords to her will. Romana planned to use the Matrix against Pandora. Capturing the APC Net, she tricked Pandora into entering a Matrix partition and used the sentience to drag her back into the Dark Partition of the Matrix. Romana then destroyed the Matrix to prevent her reappearance. (AUDIO: Warfare)