Wondrous - #Salisbury featured on a 12th century Spanish-Islamic map of England.https://twitter.com/caitlinrgreen/status/719276436851437568 …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
that would be what we know as 'Old Sarum' - the current city ('New Sarum') wasn't established until the 1220s.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.