This is my MSc thesis presentation in Greek on examining the seismic behavior of Frangavilla church, a byzantine monument of 12th century, which is located in Amalias Elias as well as of the effectiveness of strengthening measures. The first step consists of the analysis of monument’s present situation in order an assessment of all the assumptions adopted to be made. The strengthening methods that are examined are the most common methods for the byzantine monuments. The analyses were performed using code SOFiSTiK v. 10/2010. The fine elements method (FEM) was used based on codes Sofiplus v.18.1 and WinTUBE v.2011/069. Dynamic analyses were performed and the failure criterion was whether the tensile strength was exceeded or not.