An old cathedral in the village of Perissa, gave the name Santorini, to the island. The passing Frank crusades in the 13th century used to stop for supplies near to the church of Saint Irini. So they started to refer to the island as 'santa irina', which contracted later to the name as we know it today, Santorini. Before the great volcano eruption the island was completely round, so Greeks named it Strongili which means 'the circular'. The beauty of Santorini was recognized from Ancient Greeks when it took its current shape after the eruption, amd they named it Kallisti, which means 'the most beautiful'.
Photo taken at Santorini