Roman  PERIODS.  AFTR THE ROMANS LEFT BRITON IN THE EARLY FIFTH CENTURY, THE BRYTHONS RE-ESTABLISHED CONTROL BUT THE TERITORIAL DIVISIONS FOR THE POST-ROMAN PERIOD ARE UNCERTAIN. THE CITY OF CAERLOYW ( Gloucester  TODAY , STILL KNOWN AS   Caerloyw  IN MODERN   Welsh ) WAS ONE CENTRE AND   Cirencester  MAY HAVE  CONTINUED AS A TRIBAL CENTRE AS WELL. THE ONLYRELIABLE ATTESTED KINGDOM IS