Johannes Ciconia was a composer and music theorist of the late Middle Ages. He was born in Liège, but worked most of his adult life in Italy, particularly in the service of the papal chapel(s) and at Padua cathedral. Ciconia's music is an eclectic blend of styles. Pieces typical of northern Italy, such as his madrigal Una panthera, appear with pieces steeped in the French ars nova. The more complex ars subtilior style surfaces in Sus un fontayne. While it remains late medieval in style, his writing increasingly points toward the melodic patterning of the Renaissance, for instance in his setting of O rosa bella. He wrote music both secular (French virelais, Italian ballate and madrigals) and sacred (motets and Mass movements, some of themisorhythmic) in form. He is also the author of two treatises on music, Nova Musica and De Proportionibus (which expands on some ideas in Nova Musica). His theoretical ideas stem from the more conservative Marchettian tradition in contrast to those of his Paduan contemporary Prosdocimus de Beldemandis.