Note that these Chronicles are written in the Gallifreyan Reckoning (GR). Gallifreyan Reckoning matches up to Academic years, with each year starting on October 1. GR 1 is the 2014-15 academic year. Councils are given a signifier, based on Greek lettering, with the first full council being alpha (GR1), and so on. Councils after Council Omega will have a second signifier (such that Council Omega -> Council Alpha Alpha -> Council Alpha Beta). Numbers next to each councillor’s title ennumerate how many occupants of that office there have been. For those who wish to know how this maps onto regeneration cycles, those records can be found here.
Thus, the Chronicles are divided into the following broad periods: