The Company of Merchants of the Staple of England, the Merchants of the Staple, also known as the Merchant Staplers, is an English company incorporated by Royal Charter in 1319 (and so the oldest mercantile corporation in England) dealing in wool, skins, lead and tin which controlled the export of wool to the continent during the late medieval period. The company of the staple may perhaps trace its ancestry back as far as 1282 or even further.
The Staple was located in Calais from the time it was conquered by England in 1347 to its loss to France in 1558, at which time its base was moved to Bruge.
There are eighteen people in Wikipedia identified as Merchants of the Staple: Wikipedia: Category: Merchants of the Staple.
The company still exists as a charitable organization: https://merchantsofthestapleofengland.co.uk/
The records of the Company are held at the Borthwick Institute for Archives, University of York, and are indexed at JISC. Bear in mind they almost exclusively post-date the fall of Calais, when the records up to that time were lost.