Possible Clues:

• Three articles about province relating to capital city
• Sophocles, e.g
• Greek citizen
• Greek capitalist?
• Article about most of them from Ulster Association or the one conceived in Greece
• Add a layer to a dish from somewhere in Greece
• Timon, say, and a thane in plays
• A Scotsman assuming the name of a place in Greece
• Maybe Plato turned up in boring trio of articles
• Three articles about Northern Ireland — in Greek!