To mark the centenary of the assassination of Archduke Franz Ferdinand in Sarajevo, here is my limerick on the event from There Was an Old Geezer Called Caesar: A History of the World in 100 Limericks.
Three shots outside Schiller’s Food Store
And Franz Ferdinand was no more
But was there a sandwich
Clutched tight in the hand which
Had triggered an all-out world war?
The short answer to my question would seem to be no. A slightly longer answer can be found in the relevant chapter.
There are some links on my Book News page to various places you can buy the book: https://twitmericks.com/book-news/
Or I guess you can just google Gavrilo Princip sandwich!