For a further discussion of medieval calendars, as well as the Isabella Breviary itself, please see the post for January.

 

The calendar page for August, from the Breviary of Queen Isabella of Castile, Add MS 18851, f. 5

On this calendar page for August, the zodiac sign for Virgo (the Virgin) is depicted as a young woman holding a martyr's palm.  Below her a group of men continue labouring to finish the harvest, threshing wheat and gathering it into sheaves inside a timbered barn.