‘Poetry’ serves the main genre of which literary period?

Main Literary Features of The Middle English Period:
- Poetry serves as the main genre.
- Prose in English gets a strong foundation.
- The English Language reaches a considerable standard though old spelling continues.
- Drama began in the form of 'Mystery Play', 'Morality Play' and 'Interlude'.
Source: An ABC of English Literature, Dr M Mofizar Rahman.