Dahlia

Dahlia is the second king of the Fairy Clan.

Dahlia acted as the Fairy King at some point after Gloxinia joined the Demon Clan, with Gerheade acting as his assistant. Meliodas was also familiar with Dahlia.

During his time, Dahlia was never interested in the Holy War and refused to get involved with Stigma. He disappeared without explanation at some point, being later replaced as the Fairy King by Harlequin.

(Source: Nanatsu no Taizai Wiki)