Bulgaria
"Bulgarian the early season of its evangelization had been taught that no work should be performed on the Sabbath." Responsa Nicolai Papae I and Con-Consulta Bulllllgarorum, Responsum 10, found in Mansi, Sacrorum Concilorum Nova et Amplissima Colectio, Vol.15; p. 406; also Hefele, Conciliengeschicte, Vol.4, sec. 478
(Pope Nicholas I, in answer to letter from Bogaris, ruling prince of Bulgaria.) "Ques. 6-Bathing is allowed on Sunday. Ques. 10-One is to cease from work on Sunday, but not also on the Sabbath." Hefele, 4,346-352, sec. 478 The Bulgarians had been accustomed to rest on the Sabbath. Pope Nicholas writes against this practice.