Britannia Secunda was one of the provinces of Roman Britain in existence by c. 312 AD and probably created as part of the administrative reforms of the Roman Emperor Diocletian after the defeat of the usurper Allectus by Constantius Chlorus in 296 AD. The governors of Britannia Secunda were of equestrian rank although few are known by name. Their capital was at York . The province is named in the Verona List and probably encompassed all of what is now northern England and possibly north Wales. In 369, a new province of Valentia was created, probably from a portion of Britannia Secunda.