William Mayes (also known as William May) was a pirate captain and one of the original founders of Libertalia.
The Gunsway Heist 
On August 1695, William Mayes join with Richard Want and four other pirates (Including Henry Avery) to ambush the Mughal fleet making its annual pilgrimage to Mecca. The treasure convoy was comprised of twenty-five ships including the 1,600 ton flagship Ganj-i-sawai (Gunsway). All of these captains were carrying privateering commissions that implicated almost the entire Eastern Seaboard of North America.
The pirates eventually caught the Mughal convoy four or five days later. The Dolphin (Richard want's ship) was far too slow, lagging behind the rest of the pirate ships, so it was burned and the crew joined Avery on the Fancy. With the Dolphin left behind, only the Fancy, the Pearl (William Mayes), and the Portsmouth Adventure (Joseph Farrell) were present for the actual battle.
Uncharted 4: A Thief's End (2016)
In Uncharted 4 William Mayes became a pirate lord alongside Henry Avery and ten other pirates and help founded Libertalia. However soon after the construction of Libertalia, tensions grew and eventually a civil war broke out. Like the other captains, Mayes was poisoned and killed by Avery and Tew.