The True Tragedy of Richard III a source for his play, though the majority tend to favour this judgement. Geoffrey Bullough treats "The True Tragedy" as a "probable source" for "Richard III", citing several commonalities (as when, in both plays, Richard calls for a horse on Bosworth Field, yet refuses to flee the battle) — though Bullough admits that the nature of the plays' relationship is "not clear." The uncertainty in dating has allowed a few commentators to propose a reversed priority, and to argue that the author (or reviser) of "The True Tragedy" may have borrowed from Shakespeare's play. Shakespeare appears to have known of
Ricardian (Richard III) political claims of his successors, and that they were most probably in fact mistaken assumptions. The two most notable societies of Ricardians are the Richard III Society, and the Richard III Foundation, Inc. A third much smaller Ricardian organisation, composed of "collateral descendants" of Richard III, is the Plantagenet Alliance. In 2012 the Richard III Society was instrumental in leading an archaeological effort to positively locate and identify the long lost remains of Richard III, which resulted in the discovery and retrieval of the remains from beneath a Leicester car park. Subsequently, much popular historical interest was generated in this