In 747, Easter fell on 2 April, a coincidence that likely would have been remarked upon by chroniclers but was not. If Easter was being used as the beginning of the calendar year, then 2 April 747 could have been, by modern reckoning, April 748 (not on Easter). The date favoured by the preponderance of evidence is 2 April 742, based on Charlemagne's age at the time of his death. This date supports the concept that Charlemagne was technically an illegitimate child, although that is not mentioned by Einhard in either since he was born out of wedlock; Pepin and Bertrada were bound by a private contract or Friedelehe at the time of his birth, but did not marry until 744.