The Grosetts, whose rare surname had several variants, are believed to be descended from Alexander Grosier or Grosiert, a Frenchman who served in Charles I’s army and then settled in Scotland. His son Alexander, who was described as a merchant of Bo’ness, Lanarkshire, and formerly of Rotterdam, married Christian Cochran, and was granted lands in Logie, near Dunfermline, Fife, in 1711. In 1717 these were inherited by his son Archibald Grosett, who married Euphemia, daughter of James Muirhead of Bredisholm, Lanarkshire. Their third son, James, a Lisbon merchant, who was ‘a gentleman of reputation’ and ‘a rising man that way’, married Donna Leonora de Miranda of the house of Cordova.
Schaw, a younger son of Walter Grosett of Alloa, was born in 1741 and was probably involved in the family’s Portuguese interests. On 13 Mar. 1783 he married Mary Rock (1755-1807), and on the same day her sister, Hannah Spencer Rock (1759-1808), married Edward Shirley of Cockthorpe Hall. The brides became coheiresses to the Jamaican plantations of their grandfather John Spencer (d. 1768) on the decease of their brother John Spencer Rock, and of their mother Hannah (in 1797), who after the death of their father Thomas Rock in 1772, had married, 13 July 1773, Henry Shirley (d. 1812) of Upper Wimpole Street, another Jamaican planter. John Rock Grosett, who spent some of his youth in Lisbon and served briefly in the army in England, consolidated this inheritance in 1810 by marrying his orphaned first cousin, Mary Spencer Shirley. Apart from the provision which was made for his unmarried sister Hannah Spencer, Grosett succeeded to his father’s entire estate, which included personal wealth sworn under £18,000, in April 1820. However, like his father, he also experienced prolonged legal problems over his West Indian possessions, and he had to set aside £10,000 for his younger children in order to leave the properties to the eldest at his death.
He may have been introduced to Chippenham by another wealthy Jamaican planter and one of its former Members, James Dawkins. Indeed, it was on the interest of John Maitland, another former Member, who had purchased Dawkins’s property there and usually controlled one of the seats, that he first stood at the general election of 1818. Despite an active and favourable canvass, he was beaten into third place.
He declined to present the Chippenham address to Queen Caroline while she was under trial, because he thought it would prejudge the issue, and he voted in defence of ministers’ conduct towards her, 6 Feb. 1821.
In January 1824 a young cousin of his, Walter Grosett, died in Jamaica ‘from a fever caught in performing militia duty in repressing the late conspiracy among the slaves’.
Mr. Buxton’s motion of last session [15 May 1823], and above all the workings of a party in this country have produced infinite mischief, by unsettling the mind of the negro population and by the infusion of false and exaggerated expectations.
Fearing revolution, as had occurred in the French islands, he asserted the planters’ legal right to own slaves and praised the foreign secretary Canning’s ‘eloquent speech’ of 16 Mar. 1824, which had argued that practical improvements in their conditions could only realistically come from their proprietors. He agreed with George Watson Taylor’s* defence of slavery at the Devizes Bear Club dinner, 27 Aug. 1824, when he emphasized the colonial contribution to England’s naval expertise.
He divided against Catholic relief, 1 Mar., 21 Apr., 10 May, and the related Irish franchise bill, 26 Apr., and brought up another hostile constituency petition, 24 Mar. 1825.
By the late 1820s he had ceased to live at Lacock, although he retained property in Chippenham and served as a magistrate and deputy lieutenant of Wiltshire.
