Throckmorton’s father, the youngest son of the patriarchal Sir George Throckmorton†, prospered as a Mercer and land speculator, but left his son to establish himself by marriage to a wealthy Gloucestershire widow.
Throckmorton was returned for Gloucestershire to the last Elizabethan Parliament. Although not re-elected at the general election of1604 he was returned at a by-election during the first session in place of his relative Sir Richard Berkeley. He only appears once in the records of the first session, or possibly twice if, as the Journal has it, he was ordered four days before his return to consider a bill against witchcraft,
Throckmorton sold Lypiatt and other manors to Thomas Stephens† for £4,550 in 1610,
