Note 12 — VIII DATES IN COLOPHONS
Reading edition
The regnal years of Mary before her marriage are usually added to those of Philip and Mary as joint sovereigns. Thus dates from 25 July, 1554-5 July, 1555, inclusive, are quoted as 1st and 2d Philip and Mary, i.e., the first year of their joint rule and the second of Mary’s reign. Dates from 6 July (the anniversary of her accession) to 24 July, 1555, are 1st and 3d Philip and Mary, i.e., the first year of their joint rule and the third of Mary’s reign.