“There is extensive evidence of breadmaking in Ancient Egypt in the form of artistic depictions, remains of structures and items used in bread making, and remains of the dough and bread itself.
Charred crumbs of a flatbread made by Natufian hunter-gatherers from wild wheat, wild barley and plant roots between 14,600 and 11,600 years ago have been found at the archaeological site of Shubayqa 1 in the Black Desert in Jordan, predating the earliest known making of bread from cultivated wheat by thousands of years.
The most common source of leavening in antiquity was to retain a piece of dough (with sugar and water in) from the previous day to utilize as a form of sourdough starter. Pliny the Elder reported that the Gauls and Iberians used the foam skimmed from beer to produce “a lighter kind of bread than other peoples.” Parts of the ancient world that drank wine instead of beer used a paste composed of grape must and flour that was allowed to begin fermenting, or wheat bran steeped in wine, as a source for yeast.”
Excerpt Taken. History of Bread. Wikipedia