Historical information
| 689 | St John's Church founded by Ethelred of Mercia |
| 980 | The Vikings attack Chester, doing great damage |
| 1075 | St John's Church rebuilt as a cathedral by Bishop |
| 1120s | Southern sector of the city walls built |
| c1150-1200 | Western sector of the city walls built |
| 1323 | The Water Tower and spur wall from the north-west |
| 1704 | City walls partially rebuilt and converted to promenades |

