Scintilla
From Tardis Wiki, the free Doctor Who reference
Lady Scintilla, known as the "greatest of the Visionaries", was a prisoner on Shada. She was imprisoned for "conspiring with Carrionites".
Scintilla became a figure of Gallifreyan legend, appearing in books such as the children's history Our Planet Story. In that book, she was depicted as "a haughty flame-haired woman in red robes", with "six-inch razor-sharp nails painted blood red". Scintilla did have long, sharp nails, but she was actually short and dumpy. (PROSE: Shada)
