There were some precedents like a couple of albums (Rock Encounter and The Soul of Flamenco and the Essence of Rock) by Sabicas, a handful of singles by Smash, Gong, Galaxia, Flamenco or even the American-British band Carmen.
However, Triana was recognized as a pioneer of the genre since their music focuses on a homogeneous fusion of the progressive rock and flamenco.
Many bands that mixed progressive and symphonic rock with flamenco followed them such as Imán Califato independiente, Cai, Guadalquivir, Alameda or Mezquita; that's why the term Andalusian rock may be understood simply as flamenco prog.
Medina Azahara turned from progressive to a hard rock outfit in the 1980s and they remain as one of the most popular flamenco rock bands in its home nation.
Also other flamenco-influenced styles of rock emerged like the flamenco-folk band Veneno, flamenco-jazz-blues band Pata Negra among other bands that melted flamenco with African, reggae or Latin rhythms.