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The pattern is an example of Assisi embroidery. I learned about Assisi work from a book that I found at the library sale last year. According to the book, the designs were originally based on the stonework around Assisi. The blue stitching is Holbein rather than the more common backstitch, which means that the outlines are stitched in two sets of running stitch (leaving every other stitch empty the first time around, then filling them in on a second pass). This allowed the detail to appear quickly, and halved the time spent studying the chart. The yellow stitching is cross stich, and took significantly more time than I was expecting for a piece of this size, because all of the background was filled in.