What is the earliest recorded recipe for pizza ever written? I think it’s in the 1700’s, but I’m just not really sure myself, thusly my question. If this is the wrong stack to put it on I apologize. 
The earliest example of unquestionable Italian pizza in the modern sense started in the slums of Naples in the late 18th century.  These had pizza crust, tomatoes, mozzarella, basil, and other ingredients.  Since they were poor people food, it took a while for them to be documented in writing; the earliest clear description of them is from 1849.  By 1889, the monarchs of the newly unified Italy chose Pizza Margherita as the representative food of Naples. Dishes called "pizza" such as pizza rustica go back much further, first recorded in the 10th century, likely brought by the Gothic conquerors of Southern Italy.  These would have been pies of eggs, meat, fish, and/or vegetables in a short crust. If you expand the definition of pizza to "flatbread cooked with cheese and stuff on it", such a dish goes back to at least ancient Persia, and likely to prehistoric times. So, which recipe is first is going to depend on which of these definitions of pizza you're using. 