He made his Six Nations debut as a replacement against Ireland in 2005, but it was in 2007 that he had his finest moment in an Italy shirt.
Robertson scored one of Italy's four tries against Scotland at Murrayfield to secure Italy's first ever away Six Nations win he backed this up with an incredible solo try against the Welsh team the following week in Rome with the Azzurri also winning this game.
Robertson was back in action for the 2008 Six Nations, playing in four of five Tests before touring Argentina and South Africa in the summer.
He then featured in all three of Italy's autumn internationals as they went down to Australia, Argentina and the Pacific Islanders.
He continued to be a constant member of the Italy side up until 2010 when a number of injuries halted his 15's international career.