===Date Code===
Classification RB is organized by the date of birth of the biographee. When the subject is a couple, the birth date of the senior is used (as Victoria for Victoria & Albert). This avoids the challenges created by monarchs who ruled multiple countries, variations in the spelling of names, and the inadequacy of House names for identification. It has the benefit of shelving contemporaries near one another. Birth dates can be difficult to find, especially in antiquity, but they permit the shelving of living monarchs and heirs, which death dates would not, and coronation dates, which not all achieve. When dates are uncertain, the date given by [https://en.wikipedia.org/wiki/Main_Page Wikipedia] is normally used. Approximate dates are follwed by "c"for circa, as: "1069c".
Dates BC are preceded with those initials, and all dates are padded to four digits. Thus:
It has not yet been found necessary to add the day, but at need that would be added in the same way as the month. Beyond that, we'll have to think on it. So far, twins have all been dealt with in the same volume.
==Third Line==