As a fun fact, although weekdays are named after Roman gods in Romance languages, Portuguese is a notable exception. It uses a literal translation from the eccl

As a fun fact, although weekdays are named after Roman gods in Romance languages, Portuguese is a notable exception. It uses a literal translation from the ecclesiastic Latin weekdays, which refers to the days when God worked in creating the world: Monday is "Segunda-feira" (second workday), Tuesday is "Terça-feira" (third workday), and so on. The weekends had already received Judaic/Christian names, therefore weren't changed and are quite similar to the other Romance languages: Saturday is "Sábado" (derived from Sabbath) and Sunday is "Domingo" (Dominicus, Lord's day in Latin). Also, early in the Catholic tradition, Sunday the first workday and only Saturday was reserved for religious activities. For this reason, in Portuguese, the week starts in the "second" day.