Concerning the sources for most of the matter contained in the following Appendices, especially A to D, see the note at the end of the Prologue. The section A III, Durin's Folk, was probably derived from Gimli the Dwarf, who maintained his friendship with Peregrin and Meriadoc and met them again many times in Gondor and Rohan.
The legends, histories, and lore to be found in the sources are very extensive. Only selections from them, in most places much abridged, are here presented. Their principal purpose is to illustrate the War of the Ring and its origins, and to fill up some of the gaps in the main story. The ancient legends of the First Age, in which Bilbo's chief interest lay, are very briefly referred to, since they concern the ancestry of Elrond and the Númenorean kings and chieftains. Actual extracts from longer annals and tales are placed within quotation marks. Insertions of later date are enclosed in brackets. Notes within quotation marks are found in the sources. Others are editorial.[5]
The dates given are those of the Third Age, unless they are marked S.A. (Second Age) or F.A. (Fourth Age).[6] The Third Age was held to have ended when the Three Rings passed away in September 3021, but for the purposes of records in Gondor F.A.1 began on March 25, 3021. On the equation of the dating of Gondor and Shire Reckoning see Vols. I 23 and III 486. In lists the dates following the names of kings and rulers are the dates of their deaths, if only one date is given. The sign † indicates a premature death, in battle or otherwise, though an annal of the event is not always included.