- Skellig Michael: monastery, circa 6th century - St Michael's Mount: monastery, 9th century - Mont Saint-Michel: monastery & sanctuary, 708 - Sacra di San M

- Skellig Michael: monastery, circa 6th century - St Michael's Mount: monastery, 9th century - Mont Saint-Michel: monastery & sanctuary, 708 - Sacra di San Michele: monastery, circa 983-987 - San Michele Arcangelo: sanctuary, 490 (St. Michael, supposedly did appear here) - Taxiarchi Michail: monastery, 18th century (the younger one) - Stella Maris: monastery, 1185 for the latin monastery (but in fact 15th century BCE as part of Mount Carmel) So, none of them are a proper cathedrals but monasteries and sanctuaries. With San Michele Arcangelo & Mont Saint-Michel the only two important ones as pilgrimage destinations. For a partial map of St. Michael churches or alike see: https://www.reseausaintmichel.eu/carte-des-sites/ https://www.reseausaintmichel.eu/carte-des-sites/ The "line" could easily be "broken", if we add for example, the Castel Sant'Angelo in Roma (Mausoleum of Hadrian) or Saint-Michel de Cuxà. Both are far more prestigious than... Skellig Michael than nobody would know about if if was not on this "line".