In 525, Dionysius prepared a table of 95 future dates of Easter (532–626) and a set of rules ("argumenta") explaining their calculation (computus). This followed a request by Pope John I, possibly influenced by the fact that the then current Victorian table gave an Easter date for 526 (19 April) which was the 22nd day of the moon. In a previous embarrassment, this table had given Saturday, 24 April as the date of the Greek Easter in 482. Note well that only the first nine arguments are by Dionysius – arguments 10 to 16 as well as the second paragraphs of 3 and 4 and the third paragraph of 9 are later interpolations. Arguments 11 and 12 imply that these were interpolated in the year 675, shortly before Bede. Dionysius also introduced his table and arguments via a letter to a bishop Petronius (also written in 525) and added another explanatory letter (written in 526). These works in volume 67 of the 217-volume "Patrologia Latina" also include a letter from Bishop Proterius of Alexandria to Pope Leo (written before 457). Though not named by Dionysius, this collection was recently called his "Liber de Paschate" ("Book on Easter") by Audette.