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This delightful triangular building was designed by Sir Thomas Tresham (father of one of the Gunpowder Plotters) and constructed between 1593 and 1597. It is a testament to Tresham’s Roman Catholicism: the number three, symbolising the Holy Trinity, is apparent everywhere. There are three floors, trefoil windows and three triangular gables on each side.On the entrance front is the inscription ‘Tres Testimonium Dant’ (‘there are three that give witness’), a Biblical quotation from St John’s Gospel referring to the Trinity. It is also a pun on Tresham’s name; his wife called him ‘Good Tres’ in her letters.