Rondellus hails from Tallinn, Estonia. The band was formed by Maria and Robert Staak in 1993 to perform and promote medieval and renaissance music. All members of the group are professional musicians with years of experience in Estonia's finest early music groups (Hortus Musicus and others).

Rondellus' repertoire includes both sacred and secular music ranging from Gregorian chants to love and drinking songs and instrumental dances, including music of the trouvères and troubadours, works by Hildegard of Bingen, Guillaume Machaut, Francesco Landini, Guillaume Du Fay, Gilles Binchois, Josquin Des Pres and others. Together with "Sabbatum", Rondellus has recorded 4 albums.