The term “constitutional identity“ has emerged in jurisprudence and academic debate as a limit of constitutional reform and supranational integration. However, the basis of this concept is rather unclear and must be closely examined from a theoretical and comparative perspective.Therefore, the panel intends to clarify whether constitutions have implicit limits to their reform even if explicit clauses such as articles 79.3 German Basic Law, 288 Portuguese Constitution or 110.1 Greek Constitution do not exist. A similar question arises for the impact of supranational law on national constitutional law. We must reflect on how to determine the core elements of the constitution which are exempt from revision or supranational impact, in a narrow or large, dynamic way and how to harmonize the national and supranational perspective of constitutional identity. Furthermore, identification through constitutional law shall be taken into consideration.