The club formed during the 1898/99 season built around the immigrant workers coming from port areas around Wales to find employment in the newly sunk Senghenydd coal mines.

1904 saw the great religious revival[2] throughout South Wales led by the lay preacher, Evan Roberts.

Rugby was seen as a wicked sport leading to violence and drunkenness, and Roberts managed to convert so many to his cause that Senghenydd RFC disbanded due to a lack of players.

During the 1914/15 season Senghenydd applied for and was successful in gaining membership of the Welsh Rugby Union.

[3] The only major trophy the team failed to win in the 1970/71 season was the Mid District Cup, beaten by Beddau 17–11 in the final.