Today&#x27;s Pantheon, the oldest large public building in use in the world, is the work of Hadrian (76 - 117 - 138 (62)), who rebuilt a 27BC south facaded structure erected by Augustus&#x27; contemporary and latterly son-in-law Marcus Vipsanius Agrippa (&quot;M.Agrippa&quot; - now that&#x27;s a power name if ever there was one - that&#x27;s him on the left in the Louvre Museum).  Hadrian, the great builder Emperor,  was nice enough to have Agrippa&#x27;s name put on the new north facing facade.