[3] The Demons moved back to St Peters RFC after one home match of 2006 and went on to win the East Division and reach the Welsh Conference Grand Final, only to lose 22–10 to Bridgend Blue Bulls.

At the end of 2014, the two main Rugby League clubs in the city, Demons and the Cardiff Spartans decided to merge.

[8] In 2023, Cardiff made their first appearance in the Challenge Cup and reached the quarter-finals due to wins over Featherstone Rovers and Salford Red Devils in the group stage.

[11] In 2024, Cardiff reached the quarter-finals of the Challenge Cup and the semi-finals of the Women's Nines, before losing to Wigan Warriors in both competitions.

[12][13] The Super League South became the Southern Championship, a second-tier competition, in which Cardiff finished top of the table, but lost 28–8 to London Broncos in the final.