Soon after his return to England he was seized in mistake for another person, and only obtained his liberty on a bail of £1000. In 1658 he revised and altered his play of "The Guardian", and prepared it for the press under the title of "The Cutter of Coleman Street", but it did not appear until 1661. Late in 1658 Oliver Cromwell died, and Cowley took advantage of the confusion of affairs to escape to Paris, where he remained until the Restoration brought him back in Charles's train. He published in 1663 "Verses upon several occasions", in which "The Complaint" is included. He is also known for having provided the earliest reference to coca in English literature, in a poem called "A legend of coca" in his 1662 collection of poems "Six Books of Plants".