Dated at Ferrara on the fourth Calends of November [October 29, 1187], the sixth indiction. Each year of a cycle was numbered (e.g. first indiction, second indiction). Dating according to indiction remained standard. Indiction 8, in the 916th year. The beginning of the year for the indiction varied. In some areas it was collected by indiction year, every month. If the remainder is zero, then the indiction is 15. Accordingly, indiction XV can only refer to year 852.