Probably they mean to convey significant digits, though I feel it's safe to assume people would read "1300" as an approximation, not pointing to the year 726. I found it odd too.
Edit: "The newly-discovered manuscript in the National Central Library of Rome of Caedmon’s Hymn dates from between the years 800 and 830, making it the third oldest surviving text of the poem." So... 1.2k then?
Probably they mean to convey significant digits, though I feel it's safe to assume people would read "1300" as an approximation, not pointing to the year 726. I found it odd too.
Edit: "The newly-discovered manuscript in the National Central Library of Rome of Caedmon’s Hymn dates from between the years 800 and 830, making it the third oldest surviving text of the poem." So... 1.2k then?