"CASTELLA IN TUMULIS ET LONGE SALTUS LATEQUE VACANTES.

Besides these stations, there were castella at the distance of every Roman mile (seven furlongs) along the Wall, from which circumstance they are known as "mile-castles."

Leland says in 1540:"Ther was a right fair and strong castella within Old-Saresbyri longing to the Erles of Saresbyri especially the Longerpees.