Medieval period refers to music written between 500 A.D. to 1450 A.D.
Medieval means 'middle ages'
Religious music (called SACRED) was developed by monks and nuns in the monasteries.
Minstrels (or troubadours) travelled through Europe entertaining royal courts as well as ordinary people who enjoyed singing and dancing with non-religious music (called SECULAR).
The Gregorian chant was a popular style of music used within the church and sung by monks.