Historical monuments are the precious signs of our past. They are non-replaceablernfragments of our cultural heritage and their future depends on our attitudes and actionsrntowards preserving them. Attitudes are undoubtedly changing in the ways we view ourrncultural heritage and people are becoming more conscious of the unity of human valuesrnand regard ancient monuments as a common heritage.rnConservation of ancient monuments is a process which will lead to the prolongation ofrnthe life of cultural property for its utilization now and in the future. But, before practicingrnconservation, one must have a broad understanding of the field itself. This is of coursernto ensure that any action carried out during the conservation work is properly performedrnand is in accord, not only with the building requirements, but is within the scope ofrncontemporary knowledge of the subject.rnThe appropriate selection of the binding materials during the construction of stonernbridges, palaces, churches, cathedrals restoration, and conservation of historicalrnmonuments is essential at the time of intervention.rnToday, these historical structures are in different physical state, some are in relativelyrngood condition, while many are in a deplorable state.rnThe purpose of this study is to identify the method of construction and analyze thernconstruction materials which were used in Royal palace construction in order to definerntheir characteristic properties, durability and to consider the properties of originalrnmaterials, thus enlightening the usability of them in repair of such buildings. For thisrnpurpose, samples of the construction materials like binding mortar, which were used inrnFasil Ghibe Palace construction, were taken and Extracted in Ethiopian GeologicalrnSurvey Laboratory.rnThe type of binding material which was used during the construction of the Fasil Ghibbirnpalace is identified as Lime (CaO) or by its local name Nora. And also the method ofrnconstruction was by stone masonry.rnThe major cause of deterioration of the Royal Palace is due to various reasons, some ofrnwhich are long life, lack of periodic maintenance, unchecked growth of trees, grass,rnalgae & mechanical impact on the wall surface by Visitors.rnKey Words: Durability, Gondar, Heritage, Lime, Royal PalacernInvestigation