. "small fort" . . "Caer Gybi (fort)" . . . . . . . . . . . . "Holyhead" . "Monastery at Holyhead" . . "Caergybi Monastery" . . "Caergybi" . "Caer Gybi" . . . "a disused Roman fort" . . "Caer Gybi (fort)" . . .