Dydd Sant Dewi Hapis A Chi, Happy Saint David's Day To You

Dydd Sant Dewi Hapis a chi. Happy Saint David's to you.

Saint David is the patron saint of Wales. His day is on March 1st.
Welsh is the Celtic language of that country and the above is a Welsh language greeting for that day.
Be sure to eat leeks on that day, leeks are a Welsh custom and used in Welsh cooking.