Passage: Coronations may be performed for a person other than the reigning monarch. In 1170, Henry the Young King, heir apparent to the throne, was crowned as a second king of England, subordinate to his father Henry II; such coronations were common practice in mediaeval France and Germany, but this is only one of two instances of its kind in England (the other being that of Ecgfrith of Mercia in 796, crowned whilst his father, Offa of Mercia, was still alive). More commonly, a king's wife is crowned as queen consort. If the king is already married at the time of his coronation, a joint coronation of both king and queen may be performed. The first such coronation was of Henry II and Eleanor of Aquitaine in 1154; seventeen such coronations have been performed, including that of the co-rulers William III and Mary II. The most recent was that of George VI and the former Elizabeth Bowes-Lyon in 1937. If the king married, or remarried, after his coronation, or if his wife were not crowned with him for some other reason, she might be crowned in a separate ceremony. The first such separate coronation of a queen consort in England was that of Matilda of Flanders in 1068; the last was Anne Boleyn's in 1533. The most recent king to wed post-coronation, Charles II, did not have a separate coronation for his bride, Catherine of Braganza. In some instances, the king's wife was simply unable to join him in the coronation ceremony due to circumstances preventing her from doing so. In 1821, George IV's estranged wife Caroline of Brunswick was prevented from being crowned with him and when she showed up at Westminster Abbey she was denied entry and turned away. Following the English Civil War, Oliver Cromwell declined the crown but underwent a coronation in all but name in his second investiture as Lord Protector in 1657. A Prince of Wales, the monarch's heir apparent, may also be crowned in a ceremony known as an investiture.

Question: Who turned down the crown after the English Civil War?
Oliver Cromwell