"An animated altercation (in which all took part) ensued among the F.O.T.E.I. as to whether the eighth or the ninth of March was the correct date of the birth of Ireland's patron saint." (U12.572)
The exact date of birth of S. Patrick (real name Maewyn Succat) is unknown. He was born 387-390 in Scotland. He died in Co. Down around 461-464. There is some certainty that the day of his death was March 17, commemorated as S. Patrick's Day.