Final answer:
King John of England ruled so badly that the Magna Carta had to be created to establish limits on the power of the monarchy and protect the rights of the barons and freemen.
Step-by-step explanation:
The king who ruled so badly that the Magna Carta had to be created was King John of England. The Magna Carta was a document signed in 1215 that established limits on the power of the monarchy and protected the rights of the barons and freemen. King John's tyrannical rule and abuse of power led to a rebellion by the barons, who forced him to sign the Magna Carta.