Baron Rockley, of Lytchett Heath in the County of Dorset, is a title in the Peerage of the United Kingdom.
 It was created in 1934 for the Conservative politician Sir Evelyn Cecil, who had earlier represented Hertfordshire East, Aston Manor and Birmingham Aston in the House of Commons.
 He was the son of Lord Eustace Cecil, fourth son of James Gascoyne-Cecil, 2nd Marquess of Salisbury.
 s of 2013 the title is held by his great-grandson, the fourth Baron, who succeeded his father in December 2011.
 As a descendant of the second Marquess of Salisbury he is also in remainder to this peerage and its subsidiary titles, as well as to the barony of Burghley, a title held by his kinsman the Marquess of Exeter.
Hatfield Peverel Priory (also known as Hatfield Priory) was a Benedictine priory in Essex, England, founded as a secular college before 1087 and converted into priory as a cell of St Albans by William Peverel "ante" 1100.
 It is in the English Heritage Register of Parks and Gardens of Special Historic Interest in England and is located on the south side of the village of Hatfield Peverel, about 5 miles north-east of Chelmsford.
 At the Dissolution of the Monasteries, a timber frame structure dominated the property.
Hatfield is a town and civil parish in Hertfordshire, England, in the borough of Welwyn Hatfield.
 It had a population of 29,616 in 2001, increasing to 39,201 at the 2011 Census.
 The settlement is of Saxon origin.
 Hatfield House, the home of the Marquess of Salisbury, is the nucleus of the old town.
 From the 1930s when de Havilland opened a factory until the 1990s when British Aerospace closed, Hatfield was associated with aircraft design and manufacture, which employed more people than any other industry.
Robert Michael James Gascoyne-Cecil, 7th Marquess of Salisbury, (born 30 September 1946) is a British Conservative politician.
 During the 1990s, he was Leader of the House of Lords under his courtesy title of Viscount Cranborne.
 Lord Salisbury lives in one of England's largest historic houses, Hatfield House, which was built by an ancestor in the early 17th century, and he currently serves as Chancellor of the University of Hertfordshire.
Lonicera fragrantissima is a species of flowering plant in the honeysuckle family known by the common names winter honeysuckle, fragrant honeysuckle, January jasmine, Chinese honeysuckle, kiss-me-at-the-gate, and sweet breath of spring.
 It is native to China and has been an introduced species to other parts of the world.
 It was brought to the attention of western gardeners by Scottish plant hunter Robert Fortune, who was plant hunting in China for the Royal Horticultural Society.
 Fortune introduced "Lonicera fragrantissima" to England in 1845, and a few years later it was introduced to the United States.
 In 1853 the editor of American gardening magazine "The Horticulturist" wrote that the previous year he had been sent a specimen from a plant that had been flowering in the gardens of Hatfield House, the Marquess of Salisbury's stately home in Hertfordshire.
 The first mention of a specimen for commercial sale in an American plant catalogue is in 1860.
Hatfield Aerodrome, formerly (IATA: HTF, ICAO: EGTH) , was a private airfield and aircraft factory located in the town of Hatfield, Hertfordshire, England from 1930 until its closure and redevelopment in the 1990s.
Welwyn Hatfield Borough Council is the local authority for the Welwyn Hatfield non-metropolitan district of England, the United Kingdom.
 Welwyn Hatfield is located in the centre of Hertfordshire, in the East of England region.
 The Council itself is based in Welwyn Garden City, the largest settlement in the district.
The Hatfield War Memorial is a war memorial beside the Great North Road in Hatfield, Hertfordshire.
 It was one of 24 war memorials in England designed by Sir Herbert Baker, that were designated as a national collection by Historic England in 2017.
 The memorial is located near the gates of Hatfield House, and close to Hatfield railway station.
 It was unveiled in 1921, to commemorate 139 men from Hatfield killed on service during the First World War.
 A brick pavilion records the names of the dead, with further names added after the Second World War.
Bishop's Hatfield Girls' School is a girls' academy school located in Hatfield, Hertfordshire.
 It was founded in 1960 as a girls' grammar school.
 It has a sixth form of about 120 students according to the latest OFSTED report.
 The current (since September 2004) Headteacher is Theodora Nickson, and the school recently became specialised in Humanities and English.
 In the last OFSTED report it got an 'outstanding' rating.
Hatfield House is a country house set in a large park, the Great Park, on the eastern side of the town of Hatfield, Hertfordshire, England.
 The present Jacobean house, a leading example of the prodigy house, was built in 1611 by Robert Cecil, First Earl of Salisbury and Chief Minister to King James I and has been the home of the Cecil family ever since.
 It is a prime example of Jacobean architecture.
 The estate includes extensive grounds and surviving parts of an earlier palace.
 The house, currently the home of Robert Gascoyne-Cecil, 7th Marquess of Salisbury, is open to the public.

Question:  In which side of the Hatfield, Hertfordshire the home of the Marquess of Salisbury located??
Answer: on the eastern side