Unusually, she inherited essentially half the kingdom when her husband, Prasutagus, died. The other half was bequeathed to the Roman Empire, thus effectively making the Iceni have two sovereigns: Boudica and the Roman Emperor Nero. (AUDIO: The Wrath of the Iceni)
When some Romans later raped the Iceni women, Boudica's response was swift and bloody. She ordered that the agents be, according to the Seventh Doctor pretending to be John Smith, "skinned alive and impaled on posts with their intestines...in their mouths." (PROSE: Human Nature)
The Fourth Doctor and his companion Leela encountered Boudica in 60, during her revolt against the occupying Roman forces in Britannia. The Doctor recognised her on sight due to her "very, very red hair." In order to prevent Boudica from severing the Doctor's head, Leela told her that he was a prophet who foresaw her defeat at the hands of the Romans. The Doctor told her that the forces at the Roman capital Camulodunum were a decoy and Roman governor Suetonius Paulinus had stationed an army to the north and intended to attack Boudica's army while it was ransacking Camulodunum. However, this was not the case. There was no army to the north.
After the burning of Camolundunum, Boudica marched to Londinium and slaughtered almost everyone in the city including the old, the weak and the infirm. She was eventually defeated in a field in the middle of England. Her army may have numbered up to 80,000 by this time but the Doctor noted that this figure could have been exaggerated by later historians. There were no survivors. Instead of allowing the Romans to execute her, Boudica killed her daughters before killing herself. The Doctor told Leela that he had no desire to witness Boudica's defeat first hand. (AUDIO: The Wrath of the Iceni)
In actuality, two Time Lords posed as Boudica towards the end of her historical narrative. Shortly after the death of Prasutagas, Fimmilena, posing as Boudica, was badly injured. The Fourth Doctor had Romana I pose as Boudica until Fimmilena had finished healing in the TARDIS. Fimmilena disguised a corpse to make it look like she had died by a poisoned spear. (PROSE: Good Queen, Bad Queen, I Queen, You Queen)
At some point in her life, Boudica was pulled out of her own time by Momus, who wanted her to help lead Planet 12 of the Ridion Alliance into a new age of enlightenment. The Tenth Doctor convinced him to return her to her rightful place in Earth's history. (PROSE: The Lonely Computer)
The Tenth Doctor called her Boadicea (TV: The Infinite Quest) but was less certain when he met her. When asked if her name was Boudica or Boadicea, she indicated neither was correct. She tried to give him the correct name but Momus interrupted before she could say more than "Bo-". (PROSE: The Lonely Computer)