In Greek culture, people who were born on Saturday are considered to have special abilities to give blessings and curses. People who are born on Saturday are believed to have the ability to give others good luck, or bad luck and even the evil eye (mati).This dates back to byzantine times and is still believe today. I don't fully understand the reason why this superstition exists, and isn't really talked about a lot in Greek culture. If anyone knows a little bit more about this I would love to learn more.