Or How Syntagma Square got its name
A bit of history about today, September 3, compliments of Wikipedia:
The 3 September 1843 Revolution (Greek: Επανάσταση της 3ης Σεπτεμβρίου 1843, NS 13 September), was an uprising by the Greek Army in Athens, supported by large sections of the people, against the autocratic rule of King Otto. The rebels, led by veterans of the Greek War of Independence, demanded the granting of a constitution and the departure of the Bavarian officials that dominated the government. The revolution succeeded, ushering the period of constitutional monarchy in Greece.
All of this occurred out front of the Royal Palace, in the adjacent square. And ever since the square has been called Syntagma or Constitution Square.