Hadrian is a programmer famous for ICE design, his eponymous Wall being his most famous creation, which he created for the Weyland Consortium.
g00ru's quote on the card for the Hadrian's Wall ICE is, as of April 2015, the only reference to Hadrian as a programmer.
Speculatively, it seems likely that Hadrian was the ICE programmer's 'handle', chosen in reference to the Roman Emperor who ordered the construction of a famous wall in Britain.
"He had a bit of an ego, ol' Hadrian. His constructs live up to it, though."