weeks

The most widely used calendar around the world today is called the Gregorian calendar. It was introduced by Pope Gregory XIII in the 16th century CE and was a modification of an ancient Roman calendar called the Julian calendar. Even though it is named after a Pope, the Gregorian calendar is very Roman: many of the names of days and months are in honor of Roman, not Christian, deities, and it is the Romans who mostly developed and perfected the calendar that we all use today. [[{"type":"media","view_mode":"media_original","fid":"30448","attributes":{"alt":"Pope Gregory XIII, portrait by Lavinia Fontana ","class":"media-image","height":"615","style":"width: 514px; height: 615px;","typeof":"foaf:Image","width":"514"}}]] Pope Gregory XIII, portrait by Lavinia Fontana ( Public Domain ) The word calendar comes from the Latin word kalendae meaning the first