There is scarcely a region of the Roman west which can claim, superficially, to be better known than southern Gaul. There can be no lover of antiquities who has not visited Arles or Nîmes, studied the arch of Orange or the Pont du Gard, devoted some interest to the monuments of Fréjus, the sculptures of Nîmes, or the mosaics of Vienne, not to mention the houses of Glanum or Vaison which have been recovered from the earth by the dedication of Henri Rolland and Canon Sautel. And yet many of these famous monuments have had to wait until very recent years before becoming the subject of detailed monographs: so, the trophy of the Alps, the arch of Orange, or the mausoleum of Glanum. Others, without having received exhaustive publication, have only in recent decades been properly dated (the amphitheatres of Arles and Nîmes) or adequately described: I am thinking of the Maison Carrée.