In 2014 the underwater Byzantine Basilica of Saint Neophytos, dedicated to Saint Neophytos, was discovered in Lake İznik, modern-day Turkey.

The basilica had been built in the place where he was killed on the shore of the lake and subsequently became submerged after an earthquake AD740.

[1][2] It is possible, according to researchers, that the basilica was built as a result of the First Council of Nicaea, convened by Emperor Constantine the Great in the year 325.

[3] Its discovery was included in the list of top 10 archaeological discoveries of 2014 released by Archaeological Institute of America.

[1] PBS video "Secrets of the Dead: The Sunken Basilica" [2] Google Maps URL close up of site.