Question: Elizabeth Capell, Countess of Essex's father was a supporter of what cause in the English Civil War?

Documents:
source: Elizabeth Capell, Countess of Essex
text: Elizabeth Capell, Countess of Essex Elizabeth Capell, Countess of Essex (1 December 1636 – 5 February 1718; née Percy) was an English noblewoman, the daughter of Algernon Percy, 10th Earl of Northumberland. She was the wife of Arthur Capell, 1st Earl of Essex. Elizabeth was the subject of a portrait by court painter Sir Peter Lely.

source: Algernon Percy, 10th Earl of Northumberland
text: Algernon Percy, 10th Earl of Northumberland Algernon Percy, 10th Earl of Northumberland, 4th Baron Percy, KG (29 September 1602 – 13 October 1668) was an English military leader and a prominent supporter of the Parliamentary cause in the English Civil War.

source: Arthur Capell, 1st Baron Capell of Hadham
text: Arthur Capell, 1st Baron Capell of Hadham Arthur Capell, 1st Baron Capell (20 February 1608 – 9 March 1649), of Hadham Hall and Cassiobury House, Watford, both in Hertfordshire, was an English politician who sat in the House of Commons from 1640 until 1641 when he was raised to the peerage as Baron Capell. He supported the Royalist cause in the Civil War and was executed on the orders of parliament in 1649.

source: Rice Powell
text: Rice Powell Rice Powell was a Welsh Colonel in the Parliamentary army during the First English Civil War. In the Second English Civil War he allied himself with the Royalist cause. English Civil Wars. He fought in South Wales and played a significant part in events between 1642 and 1649 including a senior role during the Battle of St. Fagans.

source: Sir Edward Morgan, 1st Baronet
text: Sir Edward Morgan, 1st Baronet Sir Edward Morgan, 1st Baronet of Llantarnam (died 24 June 1653) was a Roman Catholic supporter of Charles I during the Bishops' War and the English Civil War. Charles created him a baronet in recognition of his services, but his capture during the English Civil War led to his estate being sequestered.

source: Second English Civil War
text: Second English Civil War The Second English Civil War (1648–1649) was the second of three wars known collectively as the English Civil War (or "Wars"), which refers to the series of armed conflicts and political machinations which took place between Parliamentarians and Royalists from 1642 until 1651 and also include the First English Civil War (1642–1646) and the Third English Civil War (1649–1651).

source: Levellers
text: Levellers The Levellers was a political movement during the English Civil War (1642–1651) that emphasized popular sovereignty, extended suffrage, equality before the law, and religious tolerance, all of which were expressed in the manifesto "Agreement of the People". In contrast to the Diggers, the Levellers opposed common ownership, except in cases of mutual agreement of the property owners. The Levellers came to prominence at the end of the First English Civil War (1642–1646) and were most influential before the start of the Second Civil War (1648–1649). Leveller views and support were found in the populace of the City of London and in some regiments in the New Model Army.

source: First English Civil War
text: First English Civil War The First English Civil War (1642–1646) began the series of three wars known as the English Civil War (or "Wars"). "The English Civil War" was a series of armed conflicts and political machinations that took place between Parliamentarians and Royalists from 1642 until 1651, and includes the Second English Civil War (1648–1649) and the Third English Civil War (1649–1651).

source: Bristol in the English Civil War
text: Bristol in the English Civil War During the English Civil War (1642–1651), Bristol was a key port on the west coast of England and considered strategically important by both Royalists and Parliamentarians. Initially, the leadership of Bristol wanted to keep the city neutral in the conflict. In 1642, city officials implored Thomas Essex not to occupy the city with his Parliamentarian forces. The city was weakly defended, and Essex entered without much resistance. During the conflict, Bristol was used as a receiving point for the Royalists to accept reinforcements from Ireland. The town was well fortified by the Frome and Avon rivers, as well as a medieval castle, which had been bought by the corporation when the First English Civil War broke out in 1642, and during the Parliamentary defense, earthen artillery forts.

source: Edward Burghall
text: Edward Burghall Edward Burghall (died 1665) was an English ejected minister, a Puritan who supported the Parliamentary cause in the English Civil War. He is known for a diary called "Providence improved", which describes the state of Cheshire throughout the English Civil War. From this diary the main facts of Burghall's life can also be gathered.

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Answer: Parliamentary