The Nations Cup is a rugby union competition that was first held in 2006 at Estádio Universitário in Lisbon with Argentina A, Italy A, Portugal and Russia taking part.

This partly allowed Namibia, Georgia, and Romania to warm up for the 2007 Rugby World Cup.

[3] The Emerging Springboks were crowned champions, and the Tournament has remained at Arcul de Triumf since then.

2009 saw the addition of Scotland A and France A to the tournament at the expense of the Emerging Springboks and Georgia, which both had other commitments that year.

For the 2010 edition, Romania and defending champions Scotland A returned from 2009, as did Italy A. France A, Russia, and Uruguay instead played in the 2010 Churchill Cup.

Emerging Ireland made their first appearance in the competition in 2014, along with Uruguay, Russia, and host Romania.