Nobody knows but it was either in the 2nd or third century.
St. Sophia's birth date is April 30th and her death date is July 13th.
St. Rebecca the Martyr was killed in the 3rd century in Alexandria, Egypt. There is no exact information on her date of birth or death.
Little is known about St. Valentine of Rome, including his birth date, date of death and names of his parents.
St. Gabriel is an archangel and was neither born nor will he ever die.
The date has no special significance other than it was the day assigned as the feast day of St. George. We do not know his birth date nor the date of his death.
We know virtually nothing about St. Veronica, including her date of birth and death or where she died. In fact, we do not know her real name.
We do not know the birth date nor the date of death of St. Patrick. He was just given the date of March 17th for lack of precise information on the actual date. The death date is usually the feast day of a saint because that would be the date they were reborn in heaven.
Neither the date nor place of birth is known but he died a martyr's death in Rome about the year 303.
St. Anthony was born in the year 1195 at Lisbon, Portugal and died June 13, 1231, of natural causes.
We do not know the dates but Anne was probably born about 50 BC and died fairly early in the 1st century AD.
St. Christopher's birth date is not definitively known. He is believed to have lived in the 3rd century, but the exact date of his birth is not recorded in historical documents.
It may have been St. Patrick, if his generally accepted birth and death date are correct. If they are actually true, he lived to be 106 years old.