Altar of Athena Polias
From Project Athinai
The Altar of Athena Polias dated back to the 7th century BC. It stood on the Akropolis at the east end of the central terrace surrounding the Old Temple of Athena. Its location, some 12 m east of the platform of the Old Temple of Athena, marked the place where the leveled terrace met the bedrock of the Akropolis.
The altar has most probably been remodeled during the Periclean Building Program. The stepped altar measured some 8.5 m deep.
During the Panathenaia, this altar saw the sacrifice of a hundred cows.
Brouskari, Maria; The Monuments of the Acropolis, Athens: Archaeological Receipts Fund, 2001
Hurwit, Jeffrey M.; The Acropolis in the Age of Pericles, Cambridge: Cambridge University Press, 2004