It was during his time at Oxford that Boyle was a ''[[Cavalier|Chevalier]]''. The Chevaliers are thought to have been established by royal order a few years before Boyle's time at Oxford. The period of Boyle's residence was marked by the reactionary actions of the victorious parliamentarian forces, consequently this period marked the most secretive period of Chevalier movements and thus little is known about Boyle's involvement beyond his membership.
In 1668 he left Oxford for London where he resided at the house of his sister, [[Lady Ranelagh ]], in [[Pall Mall, London |Pall Mall]].
Plaque at the site of Boyle and Hooke 's experiments in Oxford. See also [[Shelley Memorial#The Boyle-Hooke plaque|The Boyle-Hooke plaque]].]]
In 1689 his health, never very strong, began to fail seriously and he gradually withdrew from his public engagements, ceasing his communications to the Royal Society, and advertising his desire to be excused from receiving guests, "unless upon occasions very extraordinary", on Tuesday and Friday forenoon, and Wednesday and Saturday afternoon. In the leisure thus gained he wished to "recruit his spirits, range his papers", and prepare some important chemical investigations which he proposed to leave "as a kind of Hermetic legacy to the studious disciples of that art", but of which he did not make known the nature. His health became still worse in 1691, and he died on 30 December that year, just a week after that of the sister with whom he had lived for more than twenty years. Robert Boyle died from paralysis. He was buried in the churchyard of [[St Martin's in the Fields]], his funeral sermon being preached by his friend Bishop [[Gilbert Burnet]]. In his will, Boyle endowed a series of Lectures which came to be known as the [[Boyle Lectures]].
[[Image:Boyle air pump.jpg|thumb|right|Pam udara Boyle.]]