Who would be in line to the UK throne but for the Battle of Bosworth field?
The first part of your question is difficult to answer. One can only speculate on the lines of descent that may have emerged had Richard III retained the throne. His legitimate and illegitimate children died without issue. He initially named Edward, Earl of Warwick, his heir. Edward was his nephew and also the nephew of Richard’s wife Anne Neville, the daughter of Warwick the Kingmaker. After Anne’s death Richard named another nephew, John de la Pole, the son of his sister Elizabeth, as his successor. But Richard was also trying to negotiate a marriage with the sister of John II of Portugal, which might imply that he was attempting to secure a direct and legitimate bloodline. If so, then we can assume that, without his deposition, there would have been immediate successors. The question of Henry Tudor’s legitimacy is a little complicated. His dubious claim to the throne was through his mother, Margaret Beaufort, a descendant of John of Gaunt and his mistress Katherine Swynford (who was
