Dashed left edge = started before April 1377 ·
Dashed right edge = ongoing beyond April 1377
Events in April 1377 1
1300 – 1377Guillaume de MachautFrench composer and poet of Ars NovaGuillaume de Machaut was the leading composer and poet of the Ars Nova period. His Messe de Nostre Dame is the earliest known complete polyphonic mass setting by a single composer.