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?

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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!