Christian calendar "Masters of the world" at the time, the Romans spread the Julian calendar among the provinces under their dominion: Greece, Egypt, Spain, Gaul. The calendar remained in widespread use in these countries even after the fall of the Empire, and it was adopted by the Christian church, eventually becoming the basis of the calendar accepted throughout Europe. The custom was gradually introduced of counting the days of the month using Arabic numerals, from 1 to 30 or 31, as we do today. Nundinal letters were also discarded by the late first century and replaced by dominical letters and a 7-day week, a practice already customary among the Jews. Though planetary names readily gained popular appeal, they were not accepted by the Church. The church referred to the days as dies dominica (Sunday) and feria prima, secunda, tertia, quarta, quinta, sexta and sabbatum. At the same time, the days of rest (formerly the Sabbath) were moved to Sunday as the Resurrection fell on that day. The popular names, the same as those of the seven planets known by the Chaldo-Assyrians, can now be found, save one or two exceptions, in almost every European language.The English and Germans alone have kept "solis dies" for Sunday. The Roman method of counting the years was also abandoned. The Common Era, devised in 527 by the monk Dionysius Exiguus, has become widespread in Europe. The first year of this era coincides with the 753rd year after the foundation of Rome. Dionysius established 25 March as the start of the year; many countries preferred 25 December. Both dates were replaced by 1 January, which became the first day of the calendar year.