He inherited large estates in 1559 from his grandfather and namesake Thomas Tresham I, establishing him as a member of the Catholic elite.
He was widely regarded as clever and well educated, a correspondent of William Cecil, the Secretary of State to Queen Elizabeth, and Sir Christopher Hatton, the Lord Chancellor.
His recusancy, Jesuit connections and arguments for the state's lack of jurisdiction in matters of conscience made him the subject of official attention, and he was imprisoned several times and fined heavily.
[3] These heavy financial demands were, in reality, overshadowed by the expense of his building projects and his insistence on making advantageous marriages for his six daughters, bringing with them sizeable dowries (£12,200).
As a Catholic known for his connection to the Jesuit Edmund Campion, and who argued for an individual's right to act according to his conscience unmolested, he was tarred with the brush of disloyalty, a mark he fiercely rejected.
[4] He left three notable buildings in Northamptonshire, the extraordinary Rushton Triangular Lodge and the unfinished Lyveden New Bield, both of which embody the strength of his faith.