Conversation so far:
What can you tell me about this?
After 35 years of loyal service, d'Artagnan resigns as lieutenant of the Musketeers as he perceives the young king Louis XIV as weak-willed.
Why would that make him resign?
CANNOTANSWER.
What happened next?
He resolves to aid the exiled Charles II to retake the throne of England, unaware that Athos is attempting the same.
How does he help Charles?
With their assistance Charles II is restored to the throne and d'Artagnan is rewarded richly.

Question: What happened next?
Self-contained rewrite: What happened after d'Artagnan assisted Charles II to be restored to the throne?