I guess I should explain mine, too, for those who didn't want to research my shameless name-dropping.
I started out wanting to write about Sir Thomas More, as he's always been one of my fascinations, and I really thought I could fit his Utopia into a story -- especially since it tells of the travels of his character to strange lands. But then I couldn't fit fire into it, and there weren't enough words available for what I wanted to do.
In the course of researching what else happened in Tudor times, I discovered so many interesting things that I hadn't really connected to that time period, I was just paralyzed at the possibilities. Leonardo da Vinci sketched tons of things that were way ahead of the times, and the astronomical discoveries seemed quite ahead as well. Galileo got in trouble over his, and Copernicus and Brahe found things that were well out of time.
Then I got fascinated by the invention of bottled beer, because it was an "accidental invention" of the sort that I have in my time travel WIP. I started out with a time traveler going back to see the invention of bottled beer and having a fire in the control room which bounced them around through the century and caused a bunch of the other things to happen.
Then I realized that the Spanish Armada was the perfect thing to cause that, with the use of "fire ships" -- a good source of the fire that hit the time machine. So it stood to reason that the original history of the time travelers was that the Spanish Armada won that battle and they wanted to go and see it. In the course of trying to visit the famous victory, they were hit by a fireball and went careening through the time period and making what we know as our history happen instead. The Duke of Medina Sidonia was the leader of the Spanish ships, and I figured if Spain won, the future exploring ship would be His/Her Majesty's Time Machine, named for the hero of the decisive battle in history.
I never got the bottled beer in at all, in the end, but More went exploring in the future and saw his Utopia (it occurred to me much too late that I should have used the year 8272 -- U2PA on a keypad -- instead of the randomly chosen 2435), the Gregorian calendar was taken back to the past to be introduced there at the proper time, Mercator got his inspiration for his map, the astronomers saw their various discoveries out the window, Shakespeare found his "muse of fire" (from Henry V), and Spain got their butts kicked by the fire ships.
Thanks for the history lessons, HB!