John Dyer (died after 1403) was a

cloth merchant In the Middle Ages or 16th and 17th centuries, a cloth merchant was one who owned or ran a cloth (often wool) manufacturing or wholesale import or export business. A cloth merchant might additionally own a number of draper's shops. Cloth was ext ...

and member of the Parliament of England for the constituency of Maldon in Essex in the parliaments of April 1384 and February 1388. He was also wardman of Maldon in 1385–1387, assessor of taxes in 1387–1390, and warden of leather in 1395–96.DYER, John, of Maldon, Essex.
The History of Parliament. Retrieved 28 August 2017.

References

Members of Parliament for Maldon English MPs April 1384 Cloth merchants 14th-century English businesspeople 15th-century English businesspeople English MPs February 1388 {{14thC-England-MP-stub