John Aleyn
John Aleyn (fl. 1360s; died 1373) was a Canon of Windsor from 1362 to 1368 and Archdeacon of Suffolk from 1368 to 1373. Career
He was appointed:
Rector of Chelmondiston, Suffolk until 1362
Rector of Otteford, until 1368
Rector of Wederingsete
Rector of Bradstede 
Archdeacon of Suffolk 1368 - 1373
Canon and Prebendary of Wells

He was appointed to the second stall in St George's Chapel, Windsor Castle in 1362 and held it until his death in 1373. He may well be the same person as the composer Johannes Alanus. Notes 

Canons of Windsor
Archdeacons of Suffolk
1373 deaths