This is a part of the painting 'The Allegory of Good and Bad Government' (approximately from around the year 1338, 1339) made by Ambrogio Lorenzetti. It's about the effects of good government on town and country.
I was inspired by this painting thanks to Carolyn Steel's TEDtalk about how food shapes our cities. She shows this painting when she's talking about the balance between cities and country. What would Ambrogio have painted if he lived right now? Watch it here.