The term Renaissance means "rebirth." The Renaissance of English literature occurred between the years 1509 until 1649, approximately.
During this time, new ideas and inventions were developed in various disciplines. For example, in science, Copernicus raised new ways of viewing the planetary system, and Martin Luther challenged religious ideas of the day.
The literary works of Edmund Spenser and Thomas More were written during this time period.
Literature written before this time period can be considered as pre-renaissance literature.