The origins of gazpacho andaluz are mysterious, and like most things from our past have never been truly documented. What writing does exist is filled with inaccuracies, but the general consensus is that the pre-Roman Andalucians (Ibericelts) were making something akin to Gazpacho in Phoenician (and Carthiginian) times. Although, to really confuse matters so were pre-Roman Italian peninsula peoples.
In fact, a cold meal of stale bread, vinegar, olive oil, garlic, and water is common in the bread eating cultures surrounding the Mediterranean, the concept is even alluded to in the Old Testament book of Ruth (2.14) “’Come thou hither, and eat of the bread, and dip thy morsel in the vinegar.”
To confuse matters even more, the tomato plant is from South America and didn’t get to Europe until after the Spanish Conquest of the Americas from 1492 onwards… Ummm… anyway, less about that and more about the recipe :)