Scorpio
From Tardis Wiki, the free Doctor Who reference
Scorpio was a constellation visible from Earth and a sign of the Zodiac. (TV: Secrets of the Stars)
In 2009, the "Children of Scorpio" were the fifth to be brought under the control of the Ancient Lights when Martin Trueman invoked the sign into his circle. Scorpio followed Libra and preceded Sagittarius. (TV: Secrets of the Stars)
