The Central Square of Argostoli or Vallianos Square is the centerpiece of the cosmic and social life of the city, often hosting cultural and other events.

The square was built in the 1820s by the British commissioner Napier, whose name was given at the garden that is today on a hill on its southern side. At that time, the imposing court, pawnshop and school were also built in the square. The court, which was significantly affected by the 1867 earthquake, was demolished in 1906 by the mayor Spyros Kosmetatos, while at the southwestern side of the Square; the Apollon Summer Theater was constructed. The shape of the square was changed several times, while the last renovation was completed in 2017 with its complete pavement and consolidation with Lithostroto, so the visitor can tour by enjoying his walk in the entire historical center of the city.

The square is also called Vallianos square, by the benefactor Panagis Vallianos, whose statue dominates the southeastern side and is the work of the early 20th century by the famous sculptor Costas Dimitriadis. Mr. Vallianos (1814-1902) was a child of a very poor family from the village of Kerameies and learned on his own writing and reading as he never went to school, but with his siblings he created one of London’s biggest trading houses and became rich. Their donations, however, were not limited to their own homeland, for example, with the donation of P. Vallianos, the National Library of Greece in Athens.

Very close to the square to the west we come across the Rizospaston Boulevard road leading to the Rizospaston Monument, passing in front of the Kefallinia Philharmonic School founded in 1838 and the Kosmetatos House, while to the east the pedestrian walks between the Town Hall The Phokas-Kosmetatos Foundation and the headquarters of Kefallinia Regional Unity to reach the Archaeological Museum of Argostoli, the Kefalos Municipal Theater and the Courts.