Medieval English Bede's Latin work
De temporum ratione (
The Reckoning of Time), written in 725, describes Old English month names. Bede mentions
intercalation, the intercalary month being inserted around midsummer. The following is an English translation
Other Charlemagne (r. 768–814) recorded agricultural
Old High German names for the Julian months. These month- and seasonal-names remained in use, with regional variants and innovations, until the end of the Middle Ages across
German-speaking Europe, and they persisted in popular or dialectal use into the 19th century. The only agreement between the Old English and the Old High German (Carolingian) month names is the naming of April as "Easter month". Both traditions have a "holy month"; however, it is the name of September in the Old English system and of December in the Old High German one. A separate tradition of month names developed in 10th century Iceland, see #Icelandic calendar. :
Modern correspondences The Old High German month names introduced by Charlemagne persisted in regional usage and survive in German dialectal usage. The Latin month names were in predominant use throughout the medieval period, although the
Summarium Heinrici, an 11th century pedagogical compendium, in chapter II.15 (
De temporibus et mensibus et annis) advocates the use of the German month names rather than the more widespread Latin ones. In the late medieval to early modern period, dialectal or regional month names were adopted for use in
almanacs, and a number of variants or innovations developed, comparable to the tradition of "Indian month names" developed in American ''
Farmers' Almanacs in the early 20th century. Some of the Farmers' Almanacs''' "Indian month names" are in fact derived from continental tradition. The Old English month names fell out of use entirely, being revived only in a fictional context in the
Shire calendar constructed by
J. R. R. Tolkien for use in his
The Lord of the Rings. : ==Icelandic calendar==