In this paper I will write about Portuguese decorative tiles, with an emphasis on their art-historical and cultural aspects, which play a major role in creating the identity of that country. The subject covered the influences and circumstances in which Portugal was when these tiles began to develop and spread, which would include the beginning of national production and the Moorish influence from the 16th century until the golden age of the 18th century production. In addition to the theoretical part, the paper contains a practical part, in which the conservation and restoration work was carried out on the eight ceramic tiles from the Ermida de S. Bartolomeu church, Torres Novas. I carried out restoration process at the Polytechnic Institute in Tomar during the student exchange in 2017., under the guidance of professor Ricardo Triães. It consisted of mechanical and chemical cleaning of surface deposits, bonding, reconstruction and retouching. The aim of thr final work is to explain and show the importance of the tiles in Portugal as a valuable cultural and artistic heritage that tells the story of Portuguese history, religion and culture through its decorative representations.