The engineer was Giovanni Fontana, brother of Sixtus' engineer-architect Domenico Fontana, who recorded that the very day the new pope entered the Lateran, he decided that he would bring water once again to the hills of Rome, which had remained waterless and sparsely inhabited, largely by monasteries, since the original ancient aqueducts had been destroyed in the sixth century.
The engineer was Giovanni Fontana, brother of Sixtus' architect-engineer Domenico Fontana, who documented that on the day the new pope entered the Lateran, he resolved to bring water back to Rome's hills once more. These hills had been without water and sparsely populated since ancient aqueducts were destroyed in the sixth century.