--The reason for the two names.
--An Example: The Second Shepherd's Play
--The last performances of the two most complete "cycles":
"The most complete is the York cycle of forty-eight pageants. They were performed in the city of York, from the middle of the fourteenth century until 1569. There are also the Towneley plays of thirty-two pageants, once thought to have been a true 'cycle' of plays and most likely performed around the Feast of Corpus Christi probably in the town of Wakefield, England during the late Middle Ages until 1576." [Shakespeare was born in 1564; the first purpose-built theater in England, The Theatre, opened for business in 1576.]
The Morality Play
--definition: "Morality plays are a type of allegory in which the protagonist is met by personifications of various moral attributes who try to prompt him to choose a Godly life over one of evil"
--an example: Everyman -- dates from about 1510
Maybe young Shakespeare saw Morality plays in Stratford, or maybe he saw Gorboduc.