140s

• Greek astronomer and cartographer Ptolemy
  Ptolemy
  Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...
  
   provided the earliest known reference to human habitation in the area now known as Dublin. In around 140 he referred to a settlement he called Eblana
  Eblana
  Eblana is the name of an ancient Irish settlement believed by some to have occupied the same site as the modern city of Dublin, to the extent that 19th-century scholarly writers such as Louis Agassiz used Eblana as a Latin equivalent for Dublin...
  
  Civitas