Jane Templeton was a trainee Time Lord. She was stranded in ancient Egypt when she lost her TARDIS, disguised as a shabti figure. She spent centuries searching for it, finally finding it in a tomb in the Valley of the Kings in 1902. She was in her thirteenth incarnation by then.
At this point, her TARDIS was so degraded that the Seventh Doctor said it should be euthanised. The only way to do so was to fly it into the heart of a star. Because she had impersonated the god Thoth when she had first arrived, Jane was guilty of a class 2 intervention according to Time Lord law. The penalty was vapourisation. Rather than let the Doctor rescue her and take her back to Gallifrey, she evaded him by slipping time tracks and died with her TARDIS. (AUDIO: False Gods)