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For example, 621 is the first child of 62, who is the second child of 6, who is the sixth child of his parents. In the Henry System, when there are more than nine children, X is used for the 10th child, A is used for the 11th child, B is used for the 12th child, and so on.
The first certain dates are AD 222 and 235, the elections of Urban I and Liberius. The years given for the first 30 popes follow the work of Richard Adelbert Lipsius, which often show a 3-year difference with the traditional dates given by Eusebius of Caesarea. [4] These are also the dates used by the Catholic Encyclopedia. [5]