Rioghan started out as a solo project by singer and poetess Rioghan Darcy, based in Lapua, Finland. After years of writing poetry and lyrics, Rioghan was founded in 2019 with an intention to fleshen up some of her words with music.
After a while, it grew into a trio with Teemu Liekkala (guitars, bass, keys, production) and Valtteri Revonkorpi (drums) added as permanent stars for the band, and in 2024 guitarist Tero Luukkonen and bassist Antti Varjanne also officially joined the band from live line-up
The band's music is rooted deeply in both gothic and progressive metal scenes.