The idea is 3 days per decade, starting at 500 CE and working forward to present. I have chosen reverses as the theme as a lot of issues have a Ruler on the obverse that doesn´t change till they are replaced. Even if the figure or theme is common, often the legend tell a story of it´s own, or the reverse has an interesting variety, or something that makes it a bit different. So, starting now with 500CE for 3 days, see how it goes, it can be amended if required as we go. More important than anything else, HAVE FUN.