The origins of the names of the days of the week in Spanish trace back to Roman mythology. The five weekdays from Monday to Friday end in "-es", short for "dies" meaning "day" in Latin, and are named after planetary gods: Luna (Moon), Marte (Mars), Mercurio (Mercury), Júpiter (Jupiter), and Venus. Saturday comes from the Hebrew word "Sabbath" meaning day of rest, while Sunday comes from the Latin word "Domingo" meaning "Lord's day".