Thomas Tynne gained land in Northern Ireland following the division of land in 1692 which came out of an agreement between the heirs of the two daughters of Robert Devereux, 2nd Earl of Essex. Earl Ferrers, the grandson of Lady Dorothy inherited her share, and Thomas Thynne, 1st Viscount Weymouth succeeded to the inheritance of Lady Frances Devereux, the Earl's elder daughter, later Marchioness of Hertford and Duchess of Somerset. This division was uneven, and in Lord Weymouth's favour. Lord Weymouth, however, behaved generously in order to rectify this injustice to Ferrers.