Conversation so far:
What was Buckingham's rebellion in 1483 about?
Buckingham's rebellion was a failed but significant uprising, or collection of uprisings, of October 1483 in England and parts of Wales against Richard III of England.
Who started the conspiracy leading to Buckingham's rebellion in 1483?
In 1483, a conspiracy arose among a number of disaffected gentry.

Question: Why was there a conspiracy?
Self-contained rewrite: Why was there a conspiracy leading to Buckingham's rebellion in 1483?