Dionysius Exiguus (Latin for "Dionysius the Humble"; – ) was a 6th-century monk born in Scythia Minor (probably modern Dobruja, in Romania and Bulgaria). He was a member of a community of Scythian monks concentrated in Tomis (present day Constanta), the major city of Scythia Minor. Dionysius is best known as the inventor of Anno Domini (AD) dating, which is used to number the years of both the Gregorian calendar and the (Christianised) Julian calendar. Almost all churches adopted his "computus" for the dates of Easter.