was one of the provinces of
in existence by c. 312
AD and probably created as part of the administrative reforms of
the Roman Emperor Diocletian
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 .
province is named in the Verona List and
probably encompassed all of what is now northern England and possibly
, a new province of Valentia
was created, probably from
a portion of Britannia Secunda.