We nearly got a grid after the great fire in 1666. Sir Christopher Wren had a plan[1]. In any case, the fire caused a major redesign, so not quite medieval, but

We nearly got a grid after the great fire in 1666. Sir Christopher Wren had a plan[1]. In any case, the fire caused a major redesign, so not quite medieval, but not far off. [1] https://www.google.com/amp/s/www.bbc.com/news/amp/magazine-35418272 https://www.google.com/amp/s/www.bbc.com/news/amp/magazine-3...