Luis [Lewis] Mercy [Merci] was, according to Sir John Hawkins, “a celebrated performer on the flute abec [sic] and an excellent composer for that instrument.” Active between 1708 and 1751, evidence of Mercy’s performances can be traced from his second “performance in public since his arrival in England” in 1708, to a performance of his own compositions in a self-benefit concert in 1735. Despite Hawkins’ affirmation that Mercy was "an Englishman by birth," it seems more likely that Mercy's "arrival in England" was as an immigrant, who, like many other foreign musicians, came to London and eventually became a naturalized citizen.
When Mercy’s Opus 1 was first published in 1718 he was in the service of James Brydges, Earl of Carnarvon and later Duke of Chandos, to whom he dedicated his publication. Mercy was one of a large number of musicians maintained by Brydges at his estate, Cannons, under the supervision of Johann Christoph Pepusch. George Frideric Handel served as resident composer there from 1717 to 1718. While Mercy’s livelihood after he left Brydges’ employment in 1719 is unknown, it appears he continued to be at least somewhat active as a musician from the report of his 1735 concert, and the publication of his opus 2 Solos for Recorder in 1720, and his own publication of sets of six sonatas for bassoon or cello and basso continuo (c1735) and for transverse flute and b.c. (c1745).