Although anti-Catholic feeling had subsided a good deal, it flared up again due to the fake Popish Plot of 1678; this followed a false testimony from Titus Oates in which he claimed there was a conspiracy to instal a Catholic king, and he managed to ferment a renewed and fierce persecution of English Catholics.
He was arrested for supposed complicity in the Popish Plot agitation in 1678, but was allowed to go into exile.
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This was the time of Titus Oates and the "Popish Plot", and some of Walker's writings made him a suspect; however, no serious steps were taken against him, although Oxford booksellers were forbidden to sell his book, The benefits of our Saviour Jesus Christ to mankind.
He was Gentleman of the Bedchamber to Charles II; in that capacity he was sent in September 1678 with a crucial message to Danby to investigate certain allegations made by Israel Tonge, thus setting in motion the Popish Plot.
In this capacity he refused to admit Titus Oates as member of the Society, and shortly afterwards Titus attempted to carry out the Popish Plot.
Then in 1678, following the lead of Titus Oates, he gave an account of a supposed Popish Plot to the English government, and his version of the details of the murder of Sir Edmund Berry Godfrey was rewarded with £500.
When Titus Oates began his "revelations" in 1678, Sacheverell was among those who most firmly believed in the existence of a Popish Plot.