Final answer:
The King of the Catuvellauni tribe whose death triggered the Roman invasion was Prasutagus. His kingdom was annexed by the Romans, and his wife Boudica led a famous rebellion in response.
Step-by-step explanation:
The king of the Catuvellauni tribe who died and whose death was followed by the Roman invasion was Prasutagus. His death led to the annexation of his kingdom by the Romans, as he was the client king of the territory which was part of the Roman Empire, and his will was ignored by the Romans. His wife, Boudica, became famous for leading a rebellion against the Roman Empire in response to this annexation and the mistreatment that she and her daughters suffered at the hands of the Romans.