The Magna Carta - part 3 - What happened after the Magna Carta was signed

The transcript discusses the loyalty of the speaker's husband, William, to King John after the signing of the Magna Carta. Despite the Pope's condemnation of the Magna Carta, William remained loyal, leading to the First Barons' War. The war divided the speaker's family, but eventually, their son returned to support his father. The war ended with King John's death, and William was appointed protector of John's son, Henry III, during which he revived the Magna Carta.

What role did the husband of the narrator play after King John's death?

In what way did the narrator's husband contribute to the Magna Carta during his time as protector?