Arla Decanto
Arla Decanto was a Peladonian seamstress who handed over an apprentice who was like a son to her upon learning that he was part of the resistance.
Hired by Barok, Arla was to make a Cloak of Coronation for the King and was assisted by the Eighth Doctor, who initially claimed to be her new apprentice before implying that he worked for Barok. She was imprisoned for three days after the Doctor tricked her into including an Arcturan star map in the cloak and was visited by him each night, visiting the Loomhouse, the Great Lake of Undoing and Barok's private rooms where she learnt of his deference to the Arcturans.
Arla was convinced of the need for rebellion and, at the coronation, killed Barok with a sonic blaster supplied by Ssilas. The Doctor, who wanted him to stand trial, told the people of her crimes and how she had assisted him, leaving her to await their decision. (AUDIO: The Truth of Peladon)