Year 475 BC was a year of the pre-Julian Roman calendar

Roman calendar

The Roman calendar changed its form several times in the time between the founding of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or pre-Julian calendars...

. At the time, it was known as the Year of the Consulship of Poplicola and Rutilus (or, less frequently, year 279 Ab urbe condita

Ab urbe condita

Ab urbe condita is Latin for "from the founding of the City ", traditionally set in 753 BC. AUC is a year-numbering system used by some ancient Roman historians to identify particular Roman years...

). The denomination 475 BC for this year has been used since the early medieval period, when the Anno Domini

Anno Domini

and Before Christ are designations used to label or number years used with the Julian and Gregorian calendars....

 calendar era

Calendar era

A calendar era is the year numbering system used by a calendar. For example, the Gregorian calendar numbers its years in the Western Christian era . The instant, date, or year from which time is marked is called the epoch of the era...

 became the prevalent method in Europe for naming years.

Greece

• Cimon leads an Athenian
  Athens
  Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state...
  
   attack on the island of Skyros
  Skyros
  Skyros is an island in Greece, the southernmost of the Sporades, an archipelago in the Aegean Sea. Around the 2nd millennium BC and slightly later, the island was known as The Island of the Magnetes where the Magnetes used to live and later Pelasgia and Dolopia and later Skyros...
  
   and expels the indigenous inhabitants who are regarded as pirates.

Arts

• The painter Polygnotus
  Polygnotus
  Polygnotus was an ancient Greek painter from the middle of the 5th century BC, son and pupil of Aglaophon. He was a native of Thasos, but was adopted by the Athenians, and admitted to their citizenship....
  
   of Thasos
  Thasos
  Thasos or Thassos is a Greek island in the northern Aegean Sea, close to the coast of Thrace and the plain of the river Nestos but geographically part of Macedonia. It is the northernmost Greek island, and 12th largest by area...
  
  begins his work (approximate date).