Question: who said a horse my kingdom for a horse

title: Richard III (play)
text: At the Battle of Bosworth Field , Lord Stanley ( who is also Richmond 's stepfather ) and his followers desert Richard 's side , whereupon Richard calls for the execution of George Stanley , Lord Stanley 's son . This does not happen , as the battle is in full swing , and Richard is left at a disadvantage . Richard is soon unhorsed on the field at the climax of the battle , and cries out , `` A horse , a horse , my kingdom for a horse ! '' Richmond kills Richard in the final duel . Subsequently , Richmond succeeds to the throne as Henry VII , and marries Princess Elizabeth from the House of York . 

Answer: answer: Richard is soon unhorsed on the field at the climax of the battle of Bosworth Field, and cries out , `` A horse , a horse, my kingdom for a horse ! ''
answer: Richard III was the one who said "A horse , a horse , my kingdom for a horse!"