Lassells came from a cadet branch of a family that first represented Yorkshire in 1346. The Nottinghamshire branch was established at Sturton, six miles north-east of East Retford, in the fourteenth century. Lassells’ paternal grandfather, George, acquired the manor of Sturton in 1540 and represented Nottinghamshire in Parliament in 1553. The latter’s younger brother, John, was an early Protestant, and was executed for heresy in 1547. Lassells’ uncle, Brian Lassells, was returned for Nottinghamshire in 1589, possibly with the assistance of the county’s lord lieutenant, George Talbot, 6th earl of Shrewsbury. Lassells should not be confused with Brian’s son, Sir George Lassells, who was for many years a Nottinghamshire magistrate. Lassells’ father was a younger son and became a lawyer. He acquired the manor of Kneveton, in south Nottinghamshire, and married the heiress to significant property at Elston, five-and-a-half miles south-west of Newark.
Lassells was admitted to Gray’s Inn in 1598, where his father was a barrister, but he himself was not called to the bar until 1626. By 1614 he had inherited his father’s estate, the income from which was estimated by members of the Nottinghamshire bench in the 1630s at between £400 and £500.
Lassells was closely involved in Pembroke’s electioneering in and around the former Talbot estates in 1620. In November he and Pembroke approached East Retford, where Shrewsbury had been high steward, ‘for their burgess’, but without success.
Lassells left no trace on the surviving records of the 1621 Parliament. He stood for re-election in 1624 and 1625, but was rejected on the former occasion in favour of candidates of higher social status, and on the latter after the corporation agreed to elect only townsmen.
During the 1630s Lassells was in considerable trouble over his eldest son John, who had become a dangerous lunatic. He refused to pay maintenance for John or the latter’s family, despite being assessed by the overseers of the poor, and apparently threatened to sell his lands and leave the country. In January 1634 his daughter-in-law petitioned the Privy Council, whereupon Lassells claimed that his son had married without his consent and threatened to kill him and burn down his house. He also stated that he had 11 or 12 dutiful children to support and substantial debts.
It is not known which side Lassells supported during the Civil War. He made his will in 2 June 1646, in which he gave the bulk of his estate, including his house at Elston, to his youngest son Bartholomew, leaving John only £5. Although describing himself as ‘sick and weak’, he survived until the following April, when he was buried at Elston. No further members of the family sat in Parliament.
