Question: Who was the first person buried in Westminster Abbey by the only non royal ruler of Britain?

full_context: Document 1: English Civil War: Into this atmosphere General George Monck, Governor of Scotland under the Cromwells, marched south with his army from Scotland. On 4 April 1660, in the Declaration of Breda, Charles II made known the conditions of his acceptance of the Crown of England. Monck organised the Convention Parliament, which met for the first time on 25 April 1660. On 8 May 1660, it declared that King Charles II had reigned as the lawful monarch since the execution of Charles I in January 1649. Charles returned from exile on 23 May 1660. On 29 May 1660, the populace in London acclaimed him as king. His coronation took place at Westminster Abbey on 23 April 1661. These events became known as the Restoration.
Document 2: Lord Protector: The Lord Protector of the Commonwealth of England, Scotland and Ireland was the title of the head of state during the Commonwealth (or, to monarchists, the Interregnum), following the first period when a Council of State held executive power. The title was held by Oliver Cromwell (December 1653 -- September 1658) and subsequently his son and designated successor Richard Cromwell (September 1658 -- May 1659) during what is now known as The Protectorate.
Document 3: Burials and memorials in Westminster Abbey: Subsequently, it became one of Britain's most significant honours to be buried or commemorated here. The practice of burying national figures in the Abbey began under Oliver Cromwell with the burial of Admiral Robert Blake in 1657. The practice spread to include generals, admirals, politicians, doctors and scientists such as Isaac Newton, buried on 4 April 1727 and Charles Darwin buried 19 April 1882.
Document 4: Westminster Abbey: Subsequently, it became one of Britain's most significant honours to be buried or commemorated in the abbey. The practice of burying national figures in the abbey began under Oliver Cromwell with the burial of Admiral Robert Blake in 1657. The practice spread to include generals, admirals, politicians, doctors and scientists such as Isaac Newton, buried on 4 April 1727, and Charles Darwin, buried 26 April 1882. Another was William Wilberforce who led the movement to abolish slavery in the United Kingdom and the Plantations, buried on 3 August 1833. Wilberforce was buried in the north transept, close to his friend, the former Prime Minister, William Pitt.[citation needed]
Document 5: Charleston, South Carolina: After Charles II of England (1630–1685) was restored to the English throne in 1660 following Oliver Cromwell's Protectorate, he granted the chartered Province of Carolina to eight of his loyal friends, known as the Lords Proprietors, on March 24, 1663. It took seven years before the group arranged for settlement expeditions. The first of these founded Charles Town, in 1670. Governance, settlement, and development were to follow a visionary plan known as the Grand Model prepared for the Lords Proprietors by John Locke.
Document 6: Westminster Abbey: Henry III rebuilt the abbey in honour of a royal saint, Edward the Confessor, whose relics were placed in a shrine in the sanctuary. Henry III himself was interred nearby, as were many of the Plantagenet kings of England, their wives and other relatives. Until the death of George II of Great Britain in 1760, most kings and queens were buried in the abbey, some notable exceptions being Henry VI, Edward IV, Henry VIII and Charles I who are buried in St George's Chapel at Windsor Castle. Other exceptions include Richard III, now buried at Leicester Cathedral, and the de facto queen Lady Jane Grey, buried in the chapel of St Peter ad Vincula in the Tower of London. Most monarchs and royals who died after 1760 are buried either in St George's Chapel or at Frogmore to the east of Windsor Castle.[citation needed]
Document 7: Westminster Abbey: During the early 20th century it became increasingly common to bury cremated remains rather than coffins in the abbey. In 1905 the actor Sir Henry Irving was cremated and his ashes buried in Westminster Abbey, thereby becoming the first person ever to be cremated prior to interment at the abbey. The majority of interments at the Abbey are of cremated remains, but some burials still take place - Frances Challen, wife of the Rev Sebastian Charles, Canon of Westminster, was buried alongside her husband in the south choir aisle in 2014. Members of the Percy Family have a family vault, The Northumberland Vault, in St Nicholas's chapel within the abbey.
Document 8: Isaac Newton: Newton died in his sleep in London on 20 March 1727 (OS 20 March 1726; NS 31 March 1727). His body was buried in Westminster Abbey. Voltaire may have been present at his funeral. A bachelor, he had divested much of his estate to relatives during his last years, and died intestate. His papers went to John Conduitt and Catherine Barton. After his death, Newton's hair was examined and found to contain mercury, probably resulting from his alchemical pursuits. Mercury poisoning could explain Newton's eccentricity in late life.
Document 9: Westminster Abbey: It suffered damage during the turbulent 1640s, when it was attacked by Puritan iconoclasts, but was again protected by its close ties to the state during the Commonwealth period. Oliver Cromwell was given an elaborate funeral there in 1658, only to be disinterred in January 1661 and posthumously hanged from a gibbet at Tyburn.
Document 10: Protestantism: Also, other human rights were advocated for by some Protestants. For example, torture was abolished in Prussia in 1740, slavery in Britain in 1834 and in the United States in 1865 (William Wilberforce, Harriet Beecher Stowe, Abraham Lincoln - against Southern Protestants). Hugo Grotius and Samuel Pufendorf were among the first thinkers who made significant contributions to international law. The Geneva Convention, an important part of humanitarian international law, was largely the work of Henry Dunant, a reformed pietist. He also founded the Red Cross.
Document 11: Prime minister: In the mid 17th century, after the English Civil War (1642–1651), Parliament strengthened its position relative to the monarch then gained more power through the Glorious Revolution of 1688 and passage of the Bill of Rights in 1689. The monarch could no longer establish any law or impose any tax without its permission and thus the House of Commons became a part of the government. It is at this point that a modern style of prime minister begins to emerge.
Document 12: Monarchy of the United Kingdom: The Civil War culminated in the execution of the king in 1649, the overthrow of the English monarchy, and the establishment of the Commonwealth of England. Charles I's son, Charles II, was proclaimed King of Great Britain in Scotland, but he was forced to flee abroad after he invaded England and was defeated at the Battle of Worcester. In 1653, Oliver Cromwell, the most prominent military and political leader in the nation, seized power and declared himself Lord Protector (effectively becoming a military dictator, but refusing the title of king). Cromwell ruled until his death in 1658, when he was succeeded by his son Richard. The new Lord Protector had little interest in governing; he soon resigned. The lack of clear leadership led to civil and military unrest, and for a popular desire to restore the monarchy. In 1660, the monarchy was restored and Charles II returned to Britain.
Document 13: Roundhead: The Roundhead commander - in - chief of the first Civil War, Thomas Fairfax, remained a supporter of constitutional monarchy, as did many other Roundhead leaders such as Edward Montagu, 2nd Earl of Manchester and Robert Devereux, 3rd Earl of Essex; however, this party was outmanoeuvred by the more politically - adept Cromwell and his radicals, who had the backing of the New Model Army and took advantage of Charles' perceived betrayal of England by allying with the Scottish against Parliament.
Document 14: Presbyterianism: John Knox (1505–1572), a Scot who had spent time studying under Calvin in Geneva, returned to Scotland and urged his countrymen to reform the Church in line with Calvinist doctrines. After a period of religious convulsion and political conflict culminating in a victory for the Protestant party at the Siege of Leith the authority of the Church of Rome was abolished in favour of Reformation by the legislation of the Scottish Reformation Parliament in 1560. The Church was eventually organised by Andrew Melville along Presbyterian lines to become the national Church of Scotland. King James VI and I moved the Church of Scotland towards an episcopal form of government, and in 1637, James' successor, Charles I and William Laud, the Archbishop of Canterbury, attempted to force the Church of Scotland to use the Book of Common Prayer. What resulted was an armed insurrection, with many Scots signing the Solemn League and Covenant. The Covenanters would serve as the government of Scotland for nearly a decade, and would also send military support to the Parliamentarians during the English Civil War. Following the restoration of the monarchy in 1660, Charles II, despite the initial support that he received from the Covenanters, reinstated an episcopal form of government on the church.
Document 15: Royal assent: The power of parliament to pass bills was often thwarted by monarchs. Charles I dissolved parliament in 1629, after it passed motions critical of and bills seeking to restrict his arbitrary exercise of power. During the eleven years of personal rule that followed, Charles performed legally dubious actions, such as raising taxes without parliament's approval. After the English Civil War, it was accepted that parliament should be summoned to meet regularly, but it was still commonplace for monarchs to refuse royal assent to bills. In 1678, Charles II withheld his assent from a bill "for preserving the Peace of the Kingdom by raising the Militia, and continuing them in Duty for Two and Forty Days," suggesting that he, not parliament, should control the militia. The last Stuart monarch, Anne, similarly withheld on 11 March 1708, on the advice of her ministers, her assent from a bill for the settling of Militia in Scotland. No monarch has since withheld royal assent on a bill passed by the British parliament.
ground_truth: Admiral Robert Blake
sub_queries: who was the only ruler of britain who ruled instead of a king or queen Answer: Oliver Cromwell
Oliver Cromwell began buring national figures in the abbey starting with whom? Answer: Admiral Robert Blake