By April 1583, Walsingham had a spy, identified as Giordano Bruno by historian John Bossy, deployed in the French embassy in London.

What did Walsingham do?

Sir Francis Walsingham, (born c. 1532, Kent, England—died April 6, 1590, London), English statesman and diplomat who was the principal secretary (1573–90) to Queen Elizabeth I and became legendary for creating a highly effective intelligence network.

Why was Walsingham exiled?

In the autumn of 1555, as Mary's government moved from exhortation to return to the old ways, to a more sustained programme of physical coercion, Francis became one of those who could not conform and went into exile (although it is possible he left earlier, perhaps in spring of 1554).