Seven youths sleep through Decian persecution
Around 250 CE, during Emperor Decius's persecution, seven Christian youths of Ephesus hid in a cave on a nearby mountain, and Decius had its entrance walled up. They woke under Theodosius II, roughly two centuries later (309 years in the Qur'anic version), believing they had slept one night. One of them, usually named Malchus, went into town to buy bread and found crosses on the gates and a Christian city; the bishop and emperor came to the cave, heard their account, and the youths then died.