Eucleides was archon

Archon

Archon is a Greek word that means "ruler" or "lord", frequently used as the title of a specific public office. It is the masculine present participle of the verb stem ἀρχ-, meaning "to rule", derived from the same root as monarch, hierarchy, and anarchy.- Ancient Greece :In ancient Greece the...

 of Athens

Athens

Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state...

 at the end of the fifth century BC.

During the year that he spent in office (403-402 BC), the murderous oligarchy

Oligarchy

Oligarchy is a form of power structure in which power effectively rests with an elite class distinguished by royalty, wealth, family ties, commercial, and/or military legitimacy...

 of the Thirty Tyrants

Thirty Tyrants

The Thirty Tyrants were a pro-Spartan oligarchy installed in Athens after its defeat in the Peloponnesian War in 404 BC. Contemporary Athenians referred to them simply as "the oligarchy" or "the Thirty" ; the expression "Thirty Tyrants" is due to later historians...

 was driven out of Athens and the Athenian democracy

Athenian democracy

Athenian democracy developed in the Greek city-state of Athens, comprising the central city-state of Athens and the surrounding territory of Attica, around 508 BC. Athens is one of the first known democracies. Other Greek cities set up democracies, and even though most followed an Athenian model,...

 re-established. As part of the new regime, Athenians accepted a spelling reform

Spelling reform

Many languages have undergone spelling reform, where a deliberate, often officially sanctioned or mandated, change to spelling takes place. Proposals for such reform are also common....

, adopting the Ionian alphabet

Alphabet

An alphabet is a standard set of letters—basic written symbols or graphemes—each of which represents a phoneme in a spoken language, either as it exists now or as it was in the past. There are other systems, such as logographies, in which each character represents a word, morpheme, or semantic...

, which included eta

Eta (letter)

Eta ) is the seventh letter of the Greek alphabet. Originally denoting a consonant /h/, its sound value in the classical Attic dialect of Ancient Greek was a long vowel , raised to in medieval Greek, a process known as itacism.In the system of Greek numerals it has a value of 8...

 and omega

Omega

Omega is the 24th and last letter of the Greek alphabet. In the Greek numeric system, it has a value of 800. The word literally means "great O" , as opposed to omicron, which means "little O"...

.

There are inscriptions from Athens which used Ionian spelling before it was official and others which continued to use the old Attic spelling after it was repudiated.