Short answers, pulled from the story.
Robert Dudley led a force of three hundred men into Norfolk on the 6th of July 1553 to stop Mary I from taking the English crown after his father failed to secure Lady Jane Grey's succession. He sought to prevent Mary I from claiming the throne following King Edward VI's death.
Amy Robsart was found dead at her residence Cumnor Place near Oxford on the 8th of September 1560 after falling down a pair of stairs. The coroner's jury determined this event was an accident despite popular rumors that Robert Dudley arranged for his wife's death.
Queen Elizabeth asked the Privy Council to make Robert Dudley Protector of the Realm when she fell ill with smallpox in October 1562. She offered him a title together with twenty thousand pounds a year before recovering her health.
The Earl of Leicester set sail for the Low Countries from Harwich on Thursday the 9th of December 1585 and landed after a swift crossing of less than twenty-four hours. He accepted his elevation as governor-general on the 25th of January 1586 after arriving in The Hague.
Leicester's Commonwealth was written by Catholic exiles in Paris and printed anonymously in 1584 shortly after the death of Robert Dudley's son. It promoted succession of Mary Queen of Scots to the English throne while attacking the Earl as an atheistic hypocritical coward terrorizing the Queen.