In the fifth century, Athenian writing gradually switched from this local system to the more widely used Ionic alphabet, native to the eastern Aegean Islands and Asia Minor. By the late fifth century, the concurrent use of elements of the Ionic system with the traditional local alphabet had become common in private writing, and in 403 BC, it was decreed that public writing would switch to the new Ionic orthography, as part of the reform following the Thirty Tyrants. This new system, also called the "Eucleidian" alphabet, after the name of the archon Eucleides, who oversaw the decision, was to become the Classical Greek alphabet throughout the Greek-speaking world. The classical works of Attic literature were subsequently handed down to posterity in the new Ionic spelling, and it is the classical orthography in which they are read today.