Columbia subject headings:
Gildas, 516?-570?
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Historians--Great Britain--Biography.
Harvard subject headings:
Gildas, 516?-570?
Great Britain--History--To 1066--Sources.
Princeton subject headings:
Gildas, 516?-570?
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Historians--Great Britain--Biography.