Lady Livia Caralis of the House of Brightshore was a high ranking Time Lord.
Livia's TARDIS was once destroyed by Caleera when she trapped it in the transduction barrier. (AUDIO: Songs of Love) Despite being political opponents, President Romana appointed her as her successor.
In the timeline where the Moros was destroyed, Plutus was Livia's ally and became her Castellan. Because she didn't trust Romana, Livia tried to recruit Irving Braxiatel to be her liaison and spy in the Celestial Intervention Agency. Time Lords from all across Gallifrey came to Livia's inauguration, but after the Monan Host embassy exploded and killed thousands, Livia announced an alliance with the Warpwrights of Phaidon and declared war on the Monan Host. However, Kalbez and Gaal later admitted in Livia's presence that they had framed the Monan Host; upon confronting Plutus for his part in the plot, Livia was kidnapped, but she was rescued by Leela and had Plutus arrested. (AUDIO: Enemy Lines)