[3] It is preserved in the manuscript Cambridge CCC 139 as a part of the 12th-century History of the Kings attributed to Symeon of Durham.
They are derived from a manuscript which did not contain the errors of dating that crept into the surviving Anglo-Saxon manuscripts A, B, C and D. There is no further connection between the Chronicle of 957 and the first continuation, but there are several annals common to it and the Peterborough version of the Anglo-Saxon Chronicle.
These are those for 899 (death of Alfred the Great), 906 (treaty of Yttingaford), 910 (battle of Tettenhall), 914, 919, 923, 927 and 933, although the dating sometimes differs in the Peterborough version.
Some bits of information appear to be drawn from the Historia de Sancto Cuthberto.
After 934, however, the entries are wholly independent of any version of the Anglo-Saxon Chronicle and are also much fuller.