Ascaris
From Tardis Wiki, the free Doctor Who reference
Ascaris was a mute assassin in Rome. In July 64, he was hired by a centurion to assassinate Maximus Pettulian, which he succeeded in doing.
When the First Doctor claimed that he was Maximus, the centurion believed that Ascaris had failed, but gave him another chance. When he tried to kill the Doctor, the Doctor fought back, and when Vicki Pallister joined the melee, Ascaris fled out the window. A previous failure had caused the centurion to cut out his tongue, causing his muteness. (TV: The Romans)
