Six southern hemisphere teams have completed the grand slam of test wins over England, Scotland, Wales and Ireland.
South Africa have won four and New Zealand and Australia have won one each.
The 2005 All Blacks will become the second New Zealand team to win a grand slam if they beat Scotland at Murrayfield on Saturday.
Following is a history of southern hemisphere grand slam wins:
South Africa 1912-13
The second Springbok team to cross the equator based their success on a massive pack which won them a grand slam plus a victory over France.
The side were led by loose forward Billy Millar, who had been badly wounded as a 15-year-old in the Boer War. Hiking, mountaineering, boxing and rugby helped his rehabilitation.
After he was wounded again in World War One he became an international referee.
Results: Scotland 16-0, Ireland 38-0, Wales 3-0, England 9-3
South Africa 1931-2
Rugby was firmly entrenched as the sport of the Afrikaner and South Africa were the world's dominant nation with the University of Stellenbosch playing a prominent role as the game's unofficial academy.
Danie Craven, who was to become known as "Mr Rugby" during a lifetime as a player, coach and administrator, made his first tour at scrumhalf in partnership with captain Bennie Osler.
Osler's reliance on the boot was criticised both at home and abroad but his tactics were undeniably successful and he remained an enduring influence on a later generation of Springbok flyhalves.
Results: Wales 8-3, Ireland 8-3, England 7-0, Scotland 6-3
South Africa 1951-2
After defeating the All Blacks 4-0 at home in 1949, the lowest point in New Zealand history, South Africa remained the undisputed kings of world rugby.
Now coached by Craven, and captained by their dynamic number eight Hennie Muller after an injury to Basil Kenyon, they played innovative, exciting and successful rugby, losing just one of 31 games.
Their 44-0 win over Scotland is still recalled ruefully by Scots.
Results: Scotland 44-0, Ireland 17-5, Wales 6-3, England 8-3
South Africa 1960-1
Under Avril Malan the Springboks returned to their ruthless, physical pre-war style, grinding out a fourth grand slam but winning few friends in the process.
A 0-0 draw with France followed a threat by the referee to call off the game after a series of violent exchanges in the opening stages.
Results: Wales 3-0, Ireland 8-3, England 5-0, Scotland 12-5.
New Zealand 1978
Graham Mourie's side would not rank with the 1924 Invincibles or the 1967 All Blacks, who did not play each of the four home nations.
But they remain to date the only All Blacks side to win a grand slam after deciding to restrict their approach following a shock loss to Munster.
A one-point win over Five Nations champions Wales remains one of their most controversial victories after Andy Haden deliberately dived out of the lineout in order to claim a penalty.
The All Blacks did get a penalty which won the match but it was awarded for a separate infringement.
Results: Ireland 10-6, Wales 13-12, England 16-6, Scotland 18-9
The genius of Mark Ella at flyhalf combined with the brilliance of David Campese on the wing and the all-round excellence of Michael Lynagh in the centres to confirm the Wallabies had arrived as a world power.
Ella, one of three aboriginal brothers to represent Australia, scored a try in each of the four tests before retiring at the age of 25.
Good as the Australians were, the scorelines also reflect the weakness of British and Irish rugby at a time when the southern hemisphere ruled the global game.
Results: England 19-3, Ireland 16-9, Wales 28-9, Scotland 37-12