Istanbul(not Constantinople)...

The Provenance of Croissants -

Although a croissant still suggests "breakfast in Paris" to many of us, its origins are actually Hungarian. In 1686, Hungarian bakers working the night shift to prepare morning pastries heard Turkish invaders tunneling under the city. Thanks to the bakers' warning, the Hungarian army was able to rally and defeat the Turks. The Hungarian government rewarded the bakers with a mandate to create a pastry in the shape of the crescent symbol on the Turkish flag. Soon all of Europe was nibbling on the symbol of Turkish defeat...