The Ancient Greeks of the so-called "Classical Era" (c.500-336 B.C.) would have known of the existence of candles and candle sticks, but probably would not have used them themselves. Candles in that era had to be made from tallow or beeswax. The Ancient Greeks had both tallow and beeswax, but since olive oil was so cheap compared either, generally they used oil lamps fueled by low-grade olive oil for illumination, rather than candles. Beeswax candles were definitely known to the Classical Greeks -- I thin Aristotle talks about them somewhere in his works, and I KNOW that Xenophon very briefly mentions the relative merits of candles vs. lamps in his The Symposium.