Unless you accept the idea, not held by many, that Shakespeare spent less time on stage after 1604 (due to his not being in the cast of Jonson's Volpone), Shakespeare was able, as far as we know, to do the exact same things in 1605 as he had been able to in the previous couple of years.
Apparently, Macbeth and Antony and Cleopatra
One major effect in England during Shakespeare's time was the Gunpowder Plot of 1605, where a group of Catholics attempted to assassinate King James I and members of Parliament. This event may have influenced the themes of power, ambition, and political betrayal in Shakespeare's "Macbeth."
Macbeth was written in about 1604 - 1606 by William Shakespeare. But, it wasn't published until a few years later.
There are quite a few really but there are two which stand out. The Spanish Armada was defeated in 1588 when Shakespeare was 24. The Gunpowder plot was foiled November 5, 1605, when he was 41.
The Spanish Armada (1588), the death of Queen Elizabeth and accession of James I (1603), The Gunpowder Plot (1605).
Some people have suggested that Shakespeare's Macbeth was connected with the Gunpowder Plot. It was certainly written at about that time and contains a reference to the "Great Equivocator," Henry Garnet.
Most historians believe it to be somwhere between 1605-1608. Shakespeare probably only wrote the first half, and the other contributor's real literary "career" only spanned from 1606-1608.
it enabled him to retire and return to his home in startford. :D
2011-1605=406
There is no historical evidence to suggest that William Shakespeare knew Guy Fawkes personally. Shakespeare was active in London during the early 1600s, while the Gunpowder Plot, in which Fawkes was involved, took place in 1605. However, it is possible that Shakespeare was aware of Fawkes' actions, as the plot garnered significant public attention and became a topic of discussion in the years following the event.
Macbeth's references to "equivocators" could be a reference to the defences put up by those accused in the Gunpowder Plot, which they specifically called "equivocating".
The king of England in 1605 was King James I