An arms dealer and agent of the Celestis
was called the Black Man
for his unnaturally, almost charred-looking dark skin.
Homunculette met the Black Man in the ruins of London in the 22nd century after the Dalek's invasion of Earth. The Black Man had the remnants of the Toy Store, but he'd already sold the Relic to Qixotl. Later, the Doctor saw the Black Man in Mictlan. (PROSE: Alien Bodies)
In 2001, the Black Man supplied Valentine Bregman with Red Uranium to destroy the Great Urban Horror. (PROSE: This Town Will Never Let Us Go)